bumping version to 0.3.2.dev for development
updating test modules
Adding `mass` property method as alias to `m` attribute.
updating todict method to use mass instead of m attribute
adding `todict` methods to POAV, POAV1, POAV2 classes
Adding `rad2deg` kwarg to `todict` method to allow converting
angles from radians to degrees.
updating docstrings
updating test_poav_atom module
Setting `__hash__` to parent class implementation.
Tweaking Bond.__eq__ method override.
updating homepage link
removing Python 3 classifier
updating setup.py for release of version 0.3.2