Commit changes being perf analyzed
Second change for fixing #987 Improve the performance of curated feed package searches by filtering in terms of PackageRegistrations, not Packages, and thereby optimizing the SQL queries. Also adding a webpage for searching curated feeds, for debugging purposes only since nothing links to it.
Add a unit test that covers the new controller. Also adding in an ICuratedFeedService abstraction for mocking. That service doesn't feel so bad, but the test does feel a bit contrived.
Fix #987 - greatly feed up curated feed search by storing curated feed keys in the Lucene Index and using that for filtering the search results instead of hitting the database and merging lists.
Merge pull request #1023 from NuGet/tilovell-987-curatedfeed_perf

Tilovell 987 curatedfeed perf