Add text version of GPL license
Updated readme for numpy prereq
Revert "Updated readme for numpy prereq". This commit was actually for the game_class branch. I have also made the commit there so this can be reverted.

This reverts commit dd1bf6c2da9720db18c1fbbd093a7f22a9115bce.
Added source file copyright preamble to available files.
Merge branch 'master' into add_license
Added license preamble to final file.
Merge pull request #16 from ChodeGames/add_license

Add license