Cleanup

Warnings cleanup (aka OCD much ?)

Signed-off-by: nicolas-rempulski <nicolas.rempulski@gmail.com>
Replacing RhinoLauncher with SlimedRhinoLauncher

SlimedRhinoLauncher introduces :
* Rhino 1.7R5 (from wro4j)
* Rhino Optimization level 9
* Removing unused import
* Imports are only inserted once in the compile scope
* CSSLint and coffee script are now inserted as coffee-mill-maven-plugin resources

Signed-off-by: nicolas-rempulski <nicolas.rempulski@gmail.com>
Adapting CSS and Coffee processors to SlimedRhinoLauncher

Signed-off-by: nicolas-rempulski <nicolas.rempulski@gmail.com>
Correcting a bug where CSSLint is called on the stylesheets working directory for each files

CSSLint was called on the directory once for each file in the CSS working directory

Signed-off-by: nicolas-rempulski <nicolas.rempulski@gmail.com>