Fix Add Trending Shows "Not In library" now filters tvrage added shows.

Add a hover over text "In library" on Add Trending Shows to display tv database show was added from.
Merge pull request #52 from JackDandy/feature/FixTrendingFilter

Fix Add Trending Shows "Not In library" now filters tvrage added shows.
Fix reduces time API endpoint Shows takes to return results.

Fix indexer mapper caching.
Fix tvrage API garbage collection.
Merge pull request #54 from JackDandy/feature/FixAPIShowsSpeed

Fix reduces time API endpoint Shows takes to return results.