Updated many Python-side global variables to their proper naming scheme (lower_case_with_underscores).

Updated all defined Color instances in colors.py to be use their proper constant naming scheme (UPPER_CASE_WITH_UNDERSCORES).

Removed file from .gitignore that has already been removed from the repository.

The naming scheme updates are almost done on the Python-side.  The C++ side will be updated soon, as well.