Update demo games deps
Better Sourcemaps support

Differences:
--map/-m option for build is now boolean. Name for the map is taken
  from output file: {path/to/output.js}.map

Mapping with Firefox extension is not supported any more.

Source maps needs to be turned on in Chrome Developer tools.
More info: http://www.thecssninja.com/javascript/source-mapping

Conflicts:
	bin/lime.py
Demo games debug building support
Advanced building support to new audio support
Don't pre-evaluate JSON assets