Added a new method to player to check timers
Specifically the push and walk timers, whose code was repeated in each
"if" branch of movement (K_UP, K_DOWN, K_LEFT, K_RIGHT).

Also, stopped git from following the compiled .pyc files, which are
useless to us and will clean up the repository
Merge https://github.com/KevinDough/RockGame

Conflicts:
	source/finalBoss.pyc