engine: rename removeEntity to removeEntityByIt and add removeEntity helper function
engine: entity.js - add onCollision to defaultEntity
engine: mouseButtonConsumer + texturable - __init passes args to call to super(...)
engine: add collision_circle + collision_rectabgle + intersect
examples/flappy_bird_clone: index.html - include collision_circle/rectangle and intersect.js
examples/flappy_bird_clone: pipePair - inherit from collision: rectangle
examples/flappy_bird_clone: player - inherit from collision:circle + cache room
Merge pull request #1 from tomcraven/feature_circle_rect_collision

Feature circle rect collision