Added the shell SASS and JS for a theme
Merge pull request #2966 from LaurentGoderre/v4.0

Added the shell SASS and JS for a theme
Added variables for minification in the template
Merge pull request #2972 from LaurentGoderre/v4.0

Added variables for minification in the template
HACK: Temporary fix for assemble issue 139
Merge pull request #2973 from LaurentGoderre/v4.0

HACK: Temporary fix for assemble issue 139

https://github.com/assemble/assemble/issues/139