Merge pull request #7603 from lightsofapollo/concat-js-files

Bug 812396 - Aggregate javascript files to reduce load times...(cherry picked from commit 53c83ac323095856522bc00aa41d20fda1594224)

Conflicts:
	build/utils.js
(cherry picked from commit 69cfb9f7d00e5ee7886e40645240686091b6b57e)