ChronoZoom Beta Improvements: Caching, Default Collection, Queries

ChronoZoom Beta Readiness:
- Added caching layer to GetTimelines.
- Change client to load the default collection from the server (now beta content)
- Modified API/DB/UnitTest to retrieve at most maxElements (including exhibits now).
- Added CZ.Data JavaScript abstraction in preparation to sprint-5 coding.
- Fixed thumbnails to point back to beta content.
- Hid regimes and welcome-screen for non-root collection.

Misc Improvements:
- Fixed issue while clicking mediaSource link.
- Removed unused ScriptsMobile folder.
- Removed obsolete "Get" API to retrieve timelines.
- Added ability in web.config to configure max-items returned.