Maintenance release

Fixed a pretty severe bug that made it impossible to de-reference the correct variable in functions. Now you can access and modify global variables, and/or you can declare your own function level scope variables that "hides" global variables with the same name. This makes Lizzie "almost functional". I considered making it entirely functional, but since this would make it much harder to change state, I realised that the way to look at a Lizzie piece of code, is as a method to an object, where the this object is your context, at which point making it functional would have been counter productive.

This is a pretty important release, and if you've had weird bugs de-referencing your variables with previous versions, hopefully this release fixes these problems.