Builtin Compressor for static files (css/js)

[schmitch]

It would be great to have a built in compressor for static files that concate css and js files in the mustache templates and replace them with a compressed concated version on production.

Maybe this should only be done on mvn package or sbt package. Maybe we could do this with gruntjs. So when I run mvn package or sbt package a grunt taskrunner gets called that looks up all template directories that replaces special comments.

[scosenza]

Moving to #240