Revert "Merge branch 'adopt-commonjs-pattern-using-browserify' of http://github.com/chrisprice/scratch-html5 into chris"

This reverts commit dc16200e583dd0b9232593f2628fbbc1039bf63f, reversing
changes made to cf618c3ee42a55ee152c0c0b0e1c40a5b94a5062.