Reformatting docstrings and comments

By running the current 0.10.0 version of yapf on

``` Py
def func(a):
"""Do something awesome.

This is a long long long description of the awesome work that is done by this function. Despite being very detailed, it runs over the column limit.
"""
```

we basically cannot get any formatting of the docstring. Could you please help me if it is a feature that is currently absent from yapf? If it could be reformatted into something like,

``` Py
def func(a):
"""Do something awesome.

This is a long long long description of the awesome work that is done by
this function. Despite being very detailed, it runs over the column limit.
"""
```

quite a lot of something like `gq` in vim could be saved. If it could reformat the docstring in the default Sphinx, numpy, or Google format, probably it could be even more helpful.