Fixed whitespace errors - tweaked block a little
Switched getCollisions to return only key, value pairs that are actually collisions - still fixing collision bugs
Collision Detection refactor

- Use oldPos and pos instead of pos and futurePos
- Added adjacent methods (oldPos used for adjacents, pos used for
  collisions)
- Game.Entity.getCollisions returns an object with only the
  collisionTypes that occured
- Moved hero's move methods directly onto prototype
Small fix on blinking animation - still needs work
Fixing rock friction and pickup logic