Pixi and Blockly: transparent Blockly view over top of Pixi canvas, with events passed down to Pixi's canvas.
started on animation and event logic brick system.
added method caching in runtime/pythonpythonjs.py - caches on the top level container object - this is faster and makes calling from javascript easy,
this is not strictly Python, because in Python a method def could change at anytime.  To be strictly Python conformant, we would need to detect when a method is redefined at runtime and clear the method cache.
changed "bases" on class to "__bases__", this conforms with the regular Python standard.
moved create_class into runtime/builtins.py
cache all methods when class instance is created.
deprecated old-style "with x as jsobject" - because now all methods are cached by default.  Updated README and test.
Pixi and Blockly, sprite controller and logic