Add more like this endpoint to the API & configure solr to use the /mlt (MoreLikeThisRequestHandler)
Merge remote-tracking branch 'upstream/develop' into develop

Conflicts:
	opencommercesearch-api/app/org/opencommercesearch/api/ProductQuery.scala
	opencommercesearch-api/project/Build.scala
Merge pull request #194 from gsegura/develop

Add Similar Product endpoint and MoreLikeThis RequestHandler to SOLR