Fix the OData feed on preview which was a) throwing null refs b) missing a whole lot of data in fields (now that they are coming from Lucene instead of the DB) causing a blank UI to show once the throwing thing was fixed. Removed PackageIndexEntity class as it wasn't pulling much weight.
Add unit test for driving the V2 feed using the Lucene Index!
Ensured unit tests passed.
Clean up redundant lines in Packageservice.cs
Fixing search to allow an 'Owner:' operator and to not care about pluralization of the Owner, Author, and Tag operators
Merge branch 'preview' of https://github.com/NuGet/NuGetGallery into Preview_search_fixes

Conflicts:
	Website/Infrastructure/Lucene/LuceneIndexingService.cs
	Website/Infrastructure/Lucene/LuceneSearchService.cs
Merge branch 'preview' of https://github.com/NuGet/NuGetGallery into Preview_search_fixes
Fix read-only mode startup migrations issue.
Stop filtering out stop words in package ids and titles.
Fix https://github.com/NuGet/NuGetGallery/issues/714 - search relevence for 'id:silverlight unittest' is terrible because most matches don't even mention unittest anywhere.
Merge branch 'ReadonlyMode_fixes' into preview