optimized "if x in list/tuple/dict" by using Array.indexOf(x)
added Tween.js wrapper
Finished Tween.js bindings.  Added the standard way to expose wrapped js-objects using something[...] standard for builtin types: list, tuple, and dict.
introducted new language syntax: "with python:" for when it is needed to jump out of a "with javascript:" block back into normal python mode.
Merge branch 'develop' of https://github.com/PythonJS/PythonJS into develop

Conflicts:
	pythonjs.js
fixes "array builtin", reverted the code that allows javascript to call pythonjs functions.