Remove Python bytecode

Python bytecode files are automatically generated when necessary, and will
change from version to version of Python, thus making them unsuitable for
inclusion in a VCS.

You can avoid this in the future by adding `*.pyc` to [your global
.gitignore][0].

[0]: https://help.github.com/articles/ignoring-files#global-gitignore

Author: xiongchiamiov