Getting KeyError while installing with pip

Hello, I'm getting this error when installing with pip:
`KeyError: 'input_connection'`

Log is below:

```
----------------------------------------------------------------------

Deleting possibly old TVTK classes

Building TVTK classes... Traceback (most recent call last):

File "", line 1, in

File "/tmp/pip_build_root/mayavi/setup.py", line 476, in

**config

File "/usr/lib/python2.7/dist-packages/numpy/distutils/core.py", line 169, in setup

return old_setup(**new_attr)

File "/usr/lib/python2.7/distutils/core.py", line 151, in setup

dist.run_commands()

File "/usr/lib/python2.7/distutils/dist.py", line 953, in run_commands

self.run_command(cmd)

File "/usr/lib/python2.7/distutils/dist.py", line 972, in run_command

cmd_obj.run()

File "/usr/lib/python2.7/dist-packages/numpy/distutils/command/install.py", line 59, in run

r = self.setuptools_run()

File "/usr/lib/python2.7/dist-packages/numpy/distutils/command/install.py", line 33, in setuptools_run

return old_install_mod._install.run(self)

File "/usr/lib/python2.7/distutils/command/install.py", line 613, in run

self.run_command(cmd_name)

File "/usr/lib/python2.7/distutils/cmd.py", line 326, in run_command

self.distribution.run_command(command)

File "/usr/lib/python2.7/distutils/dist.py", line 972, in run_command

cmd_obj.run()

File "/tmp/pip_build_root/mayavi/setup.py", line 361, in run

build_tvtk_classes_zip()

File "/tmp/pip_build_root/mayavi/setup.py", line 294, in build_tvtk_classes_zip

gen_tvtk_classes_zip()

File "tvtk/setup.py", line 66, in gen_tvtk_classes_zip

import numpy

File "/tmp/pip_build_root/mayavi/tvtk/code_gen.py", line 117, in generate_code

self._write_wrapper_class(node, tvtk_name)

File "/tmp/pip_build_root/mayavi/tvtk/code_gen.py", line 207, in _write_wrapper_class

self.wrap_gen.generate_code(node, out)

File "/tmp/pip_build_root/mayavi/tvtk/wrapper_gen.py", line 84, in generate_code

self._gen_methods(node, out)

File "/tmp/pip_build_root/mayavi/tvtk/wrapper_gen.py", line 195, in _gen_methods

get_set = self._gen_get_set_methods(klass, out)

File "/tmp/pip_build_root/mayavi/tvtk/wrapper_gen.py", line 570, in _gen_get_set_methods

del updateable_traits['input_connection']

KeyError: 'input_connection'

----------------------------------------
Cleaning up...
Removing temporary dir /tmp/pip_build_root...
Command /usr/bin/python -c "import setuptools, tokenize;__file__='/tmp/pip_build_root/mayavi/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-4k301K-record/install-record.txt --single-version-externally-managed --compile failed with error code 1 in /tmp/pip_build_root/mayavi
Exception information:
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 122, in main
status = self.run(options, args)
File "/usr/lib/python2.7/dist-packages/pip/commands/install.py", line 283, in run
requirement_set.install(install_options, global_options, root=options.root_path)
File "/usr/lib/python2.7/dist-packages/pip/req.py", line 1436, in install
requirement.install(install_options, global_options, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/pip/req.py", line 707, in install
cwd=self.source_dir, filter_stdout=self._filter_install, show_stdout=False)
File "/usr/lib/python2.7/dist-packages/pip/util.py", line 715, in call_subprocess
% (command_desc, proc.returncode, cwd))
InstallationError: Command /usr/bin/python -c "import setuptools, tokenize;__file__='/tmp/pip_build_root/mayavi/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-4k301K-record/install-record.txt --single-version-externally-managed --compile failed with error code 1 in /tmp/pip_build_root/mayavi
```

Full log:
[pip_log.txt](https://github.com/enthought/mayavi/files/329016/pip_log.txt)