Cannot pickle certain type hints

```
> python --version
Python 2.7.11 :: Anaconda 4.0.0 (x86_64)
```

Also

``` python
>>> cloudpickle.__version__
'0.1.1'
```

Hi, I'm trying to pickle some stuff in the `typing` module. I'm curious if there are fundamental limitations here or if this is out of scope for cloudpickle. Thanks for your help!

``` python
from typing import List, Callable
from cloudpickle import loads, dumps
```

This works.

``` python
>>> List
typing.List<~T>

>>> loads(dumps(List))
typing.List<~T>
```

This seems to lose some information.

``` python
>>> Callable[[int, str], float]
typing.Callable[[int, str], float]

>>> loads(dumps(Callable[[int, str], float]))
typing.Callable
```

This doesn't work

``` python
>>> dumps(List[int])
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
in ()
----> 1 dumps(List[int])

/Users/rkn/anaconda/lib/python2.7/site-packages/cloudpickle/cloudpickle.pyc in dumps(obj, protocol)
600
601 cp = CloudPickler(file,protocol)
--> 602 cp.dump(obj)
603
604 return file.getvalue()

/Users/rkn/anaconda/lib/python2.7/site-packages/cloudpickle/cloudpickle.pyc in dump(self, obj)
105 self.inject_addons()
106 try:
--> 107 return Pickler.dump(self, obj)
108 except RuntimeError as e:
109 if 'recursion' in e.args[0]:

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in dump(self, obj)
222 if self.proto >= 2:
223 self.write(PROTO + chr(self.proto))
--> 224 self.save(obj)
225 self.write(STOP)
226

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
298 issc = 0
299 if issc:
--> 300 self.save_global(obj)
301 return
302

/Users/rkn/anaconda/lib/python2.7/site-packages/cloudpickle/cloudpickle.pyc in save_global(self, obj, name, pack)
351 d['__new__'] = obj.__new__
352
--> 353 self.save_reduce(typ, (obj.__name__, obj.__bases__, d), obj=obj)
354 else:
355 raise pickle.PicklingError("Can't pickle %r" % obj)

/Users/rkn/anaconda/lib/python2.7/site-packages/cloudpickle/cloudpickle.pyc in save_reduce(self, func, args, state, listitems, dictitems, obj)
509 else:
510 save(func)
--> 511 save(args)
512 write(pickle.REDUCE)
513

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
284 f = self.dispatch.get(t)
285 if f:
--> 286 f(self, obj) # Call unbound method with explicit self
287 return
288

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save_tuple(self, obj)
552 if n <= 3 and proto >= 2:
553 for element in obj:
--> 554 save(element)
555 # Subtle. Same as in the big comment below.
556 if id(obj) in memo:

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
284 f = self.dispatch.get(t)
285 if f:
--> 286 f(self, obj) # Call unbound method with explicit self
287 return
288

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save_tuple(self, obj)
552 if n <= 3 and proto >= 2:
553 for element in obj:
--> 554 save(element)
555 # Subtle. Same as in the big comment below.
556 if id(obj) in memo:

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
298 issc = 0
299 if issc:
--> 300 self.save_global(obj)
301 return
302

/Users/rkn/anaconda/lib/python2.7/site-packages/cloudpickle/cloudpickle.pyc in save_global(self, obj, name, pack)
351 d['__new__'] = obj.__new__
352
--> 353 self.save_reduce(typ, (obj.__name__, obj.__bases__, d), obj=obj)
354 else:
355 raise pickle.PicklingError("Can't pickle %r" % obj)

/Users/rkn/anaconda/lib/python2.7/site-packages/cloudpickle/cloudpickle.pyc in save_reduce(self, func, args, state, listitems, dictitems, obj)
509 else:
510 save(func)
--> 511 save(args)
512 write(pickle.REDUCE)
513

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
284 f = self.dispatch.get(t)
285 if f:
--> 286 f(self, obj) # Call unbound method with explicit self
287 return
288

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save_tuple(self, obj)
552 if n <= 3 and proto >= 2:
553 for element in obj:
--> 554 save(element)
555 # Subtle. Same as in the big comment below.
556 if id(obj) in memo:

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
284 f = self.dispatch.get(t)
285 if f:
--> 286 f(self, obj) # Call unbound method with explicit self
287 return
288

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save_tuple(self, obj)
552 if n <= 3 and proto >= 2:
553 for element in obj:
--> 554 save(element)
555 # Subtle. Same as in the big comment below.
556 if id(obj) in memo:

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
298 issc = 0
299 if issc:
--> 300 self.save_global(obj)
301 return
302

/Users/rkn/anaconda/lib/python2.7/site-packages/cloudpickle/cloudpickle.pyc in save_global(self, obj, name, pack)
351 d['__new__'] = obj.__new__
352
--> 353 self.save_reduce(typ, (obj.__name__, obj.__bases__, d), obj=obj)
354 else:
355 raise pickle.PicklingError("Can't pickle %r" % obj)

/Users/rkn/anaconda/lib/python2.7/site-packages/cloudpickle/cloudpickle.pyc in save_reduce(self, func, args, state, listitems, dictitems, obj)
509 else:
510 save(func)
--> 511 save(args)
512 write(pickle.REDUCE)
513

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
284 f = self.dispatch.get(t)
285 if f:
--> 286 f(self, obj) # Call unbound method with explicit self
287 return
288

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save_tuple(self, obj)
552 if n <= 3 and proto >= 2:
553 for element in obj:
--> 554 save(element)
555 # Subtle. Same as in the big comment below.
556 if id(obj) in memo:

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
284 f = self.dispatch.get(t)
285 if f:
--> 286 f(self, obj) # Call unbound method with explicit self
287 return
288

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save_tuple(self, obj)
566 write(MARK)
567 for element in obj:
--> 568 save(element)
569
570 if id(obj) in memo:

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
298 issc = 0
299 if issc:
--> 300 self.save_global(obj)
301 return
302

/Users/rkn/anaconda/lib/python2.7/site-packages/cloudpickle/cloudpickle.pyc in save_global(self, obj, name, pack)
351 d['__new__'] = obj.__new__
352
--> 353 self.save_reduce(typ, (obj.__name__, obj.__bases__, d), obj=obj)
354 else:
355 raise pickle.PicklingError("Can't pickle %r" % obj)

/Users/rkn/anaconda/lib/python2.7/site-packages/cloudpickle/cloudpickle.pyc in save_reduce(self, func, args, state, listitems, dictitems, obj)
509 else:
510 save(func)
--> 511 save(args)
512 write(pickle.REDUCE)
513

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
284 f = self.dispatch.get(t)
285 if f:
--> 286 f(self, obj) # Call unbound method with explicit self
287 return
288

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save_tuple(self, obj)
552 if n <= 3 and proto >= 2:
553 for element in obj:
--> 554 save(element)
555 # Subtle. Same as in the big comment below.
556 if id(obj) in memo:

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
284 f = self.dispatch.get(t)
285 if f:
--> 286 f(self, obj) # Call unbound method with explicit self
287 return
288

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save_tuple(self, obj)
552 if n <= 3 and proto >= 2:
553 for element in obj:
--> 554 save(element)
555 # Subtle. Same as in the big comment below.
556 if id(obj) in memo:

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
298 issc = 0
299 if issc:
--> 300 self.save_global(obj)
301 return
302

/Users/rkn/anaconda/lib/python2.7/site-packages/cloudpickle/cloudpickle.pyc in save_global(self, obj, name, pack)
351 d['__new__'] = obj.__new__
352
--> 353 self.save_reduce(typ, (obj.__name__, obj.__bases__, d), obj=obj)
354 else:
355 raise pickle.PicklingError("Can't pickle %r" % obj)

/Users/rkn/anaconda/lib/python2.7/site-packages/cloudpickle/cloudpickle.pyc in save_reduce(self, func, args, state, listitems, dictitems, obj)
509 else:
510 save(func)
--> 511 save(args)
512 write(pickle.REDUCE)
513

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
284 f = self.dispatch.get(t)
285 if f:
--> 286 f(self, obj) # Call unbound method with explicit self
287 return
288

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save_tuple(self, obj)
552 if n <= 3 and proto >= 2:
553 for element in obj:
--> 554 save(element)
555 # Subtle. Same as in the big comment below.
556 if id(obj) in memo:

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
284 f = self.dispatch.get(t)
285 if f:
--> 286 f(self, obj) # Call unbound method with explicit self
287 return
288

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save_dict(self, obj)
653
654 self.memoize(obj)
--> 655 self._batch_setitems(obj.iteritems())
656
657 dispatch[DictionaryType] = save_dict

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in _batch_setitems(self, items)
685 for k, v in tmp:
686 save(k)
--> 687 save(v)
688 write(SETITEMS)
689 elif n:

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
329
330 # Save the reduce() output and finally memoize the object
--> 331 self.save_reduce(obj=obj, *rv)
332
333 def persistent_id(self, obj):

/Users/rkn/anaconda/lib/python2.7/site-packages/cloudpickle/cloudpickle.pyc in save_reduce(self, func, args, state, listitems, dictitems, obj)
527
528 if state is not None:
--> 529 save(state)
530 write(pickle.BUILD)
531

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
284 f = self.dispatch.get(t)
285 if f:
--> 286 f(self, obj) # Call unbound method with explicit self
287 return
288

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save_dict(self, obj)
653
654 self.memoize(obj)
--> 655 self._batch_setitems(obj.iteritems())
656
657 dispatch[DictionaryType] = save_dict

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in _batch_setitems(self, items)
685 for k, v in tmp:
686 save(k)
--> 687 save(v)
688 write(SETITEMS)
689 elif n:

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
284 f = self.dispatch.get(t)
285 if f:
--> 286 f(self, obj) # Call unbound method with explicit self
287 return
288

/Users/rkn/anaconda/lib/python2.7/site-packages/cloudpickle/cloudpickle.pyc in save_function(self, obj, name)
197 klass = getattr(themodule, name, None)
198 if klass is None or klass is not obj:
--> 199 self.save_function_tuple(obj)
200 return
201

/Users/rkn/anaconda/lib/python2.7/site-packages/cloudpickle/cloudpickle.pyc in save_function_tuple(self, func)
240 # save the rest of the func data needed by _fill_function
241 save(f_globals)
--> 242 save(defaults)
243 save(dct)
244 write(pickle.TUPLE)

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
284 f = self.dispatch.get(t)
285 if f:
--> 286 f(self, obj) # Call unbound method with explicit self
287 return
288

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save_tuple(self, obj)
552 if n <= 3 and proto >= 2:
553 for element in obj:
--> 554 save(element)
555 # Subtle. Same as in the big comment below.
556 if id(obj) in memo:

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
329
330 # Save the reduce() output and finally memoize the object
--> 331 self.save_reduce(obj=obj, *rv)
332
333 def persistent_id(self, obj):

/Users/rkn/anaconda/lib/python2.7/site-packages/cloudpickle/cloudpickle.pyc in save_reduce(self, func, args, state, listitems, dictitems, obj)
494 "args[0] from __newobj__ args has the wrong class")
495 args = args[1:]
--> 496 save(cls)
497
498 #Don't pickle transient entries

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
284 f = self.dispatch.get(t)
285 if f:
--> 286 f(self, obj) # Call unbound method with explicit self
287 return
288

/Users/rkn/anaconda/lib/python2.7/site-packages/cloudpickle/cloudpickle.pyc in save_global(self, obj, name, pack)
351 d['__new__'] = obj.__new__
352
--> 353 self.save_reduce(typ, (obj.__name__, obj.__bases__, d), obj=obj)
354 else:
355 raise pickle.PicklingError("Can't pickle %r" % obj)

/Users/rkn/anaconda/lib/python2.7/site-packages/cloudpickle/cloudpickle.pyc in save_reduce(self, func, args, state, listitems, dictitems, obj)
509 else:
510 save(func)
--> 511 save(args)
512 write(pickle.REDUCE)
513

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
284 f = self.dispatch.get(t)
285 if f:
--> 286 f(self, obj) # Call unbound method with explicit self
287 return
288

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save_tuple(self, obj)
552 if n <= 3 and proto >= 2:
553 for element in obj:
--> 554 save(element)
555 # Subtle. Same as in the big comment below.
556 if id(obj) in memo:

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
284 f = self.dispatch.get(t)
285 if f:
--> 286 f(self, obj) # Call unbound method with explicit self
287 return
288

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save_dict(self, obj)
653
654 self.memoize(obj)
--> 655 self._batch_setitems(obj.iteritems())
656
657 dispatch[DictionaryType] = save_dict

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in _batch_setitems(self, items)
685 for k, v in tmp:
686 save(k)
--> 687 save(v)
688 write(SETITEMS)
689 elif n:

/Users/rkn/anaconda/lib/python2.7/pickle.pyc in save(self, obj)
304 reduce = getattr(obj, "__reduce_ex__", None)
305 if reduce:
--> 306 rv = reduce(self.proto)
307 else:
308 reduce = getattr(obj, "__reduce__", None)

TypeError: can't pickle wrapper_descriptor objects
```