Added geometry info to game objects
Added walls to LevelBlocks
Made current LevelBlocks into clouds, so that a player can jump onto
them from beneath
Initial collision detector added
Removed redundant imports
Added callback method for when objects stop colliding
Made distance between platforms smaller
Made platform texture init method protected so that the class can be
subclassed
Made textures protected for subclassing
Added walls for edge blocking
update credits to sync with new artworkt