Merge pull request #141 from candrews/1.7.x

Use maven for the grails plugin, including build and release
Arrange contents and fix less being coffe typo

I found out that the sorting was confusing, maybe this way would be easier to understand. :)
There was a typo where LessCssProcessor should be.
Also, some people recommend using lesscssprocessor, pre and post. https://code.google.com/p/wro4j/wiki/MavenPluginWithLessCss
Merge branch 'typo' into 2.0.x