#396 - Fix init_submodule_submodules
#396 - Add with_clean_bundler_env block scoping method
#396 - Fix bug in clean if files don't exist
#396 - Add OptiCSS package for stylesheet splitting
#396 - Update OptiCSS to not split on single produced file
#396 - Add config properties for OptiCSS
Add OptiCSS package handler
Merge pull request #398 from ebollens/feature/396

Fix #396 - Add support for CSS splitting