updated to less v1.3.3
added newely-required library dependencies to environment
added new stubs
stubbed http concat of less files
Fix tests for less 1.3.3
Merge pull request #1 from avsej/v2.2.2-less1.3.3

Fix tests for less 1.3.3
Merge remote-tracking branch 'populr/v2.2.2-less1.3.3'

Conflicts:
	lib/less/java_script/v8_context.rb