Similar content

Initial commit that computes similarity based on number of
co-occurring genres and people. Runs over PA content, on
top-level content (containers and top-level items).

Currently only logs at TRACE level the output, this first
push is to look at performance.
Merge branch 'similar-content-updater' into stage

Conflicts:
	src/main/java/org/atlasapi/remotesite/metabroadcast/similar/SimilarContentUpdater.java