Merge branch 'stack-overflow-fix2'

Conflicts:
	lib/mu/renderer.js
Merge branch 'multiple-mu-instances'
More function support
Merge branch 'more-functions'

Conflicts:
	lib/mu/renderer.js
	test/run_examples_test.js
Version 0.5.19-p1, with stack-overflow-fix2, multiple-mu-instances and more-functions