SLING-4181 - Remove unneeded reference to SlingRepository from ClassUnitLoader

* removed unneeded reference
* reorganised imports

This closes #41

(Applied patch by Radu Cotescu, Thanks)


git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1640225 13f79535-47bb-0310-9956-ffa450edef68