SLING-4182 - Cleanup Sightly Engine dependencies

 downgraded dependencies
 cleaned up some unused imports

This closes #42

(Applied patch by Radu Cotescu. Thanks alot)


git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1640285 13f79535-47bb-0310-9956-ffa450edef68