Merge pull request #114 from chuckdumont/jaggr-core

Rename of AggregatorImpl.java to AbstractAggregatorImpl.java and
Merge pull request #115 from chuckdumont/jaggr-core

Create new AggregatorImpl.java and DojoHttpTransport.java
Merge pull request #117 from chuckdumont/jaggr-core

Add missing copyright notices
Remove OSGi dependencies from AbstractHttpTransport and
AbstractDojoHttpTransport, into DojoHttpTransport