Adding a what's new in the store signalr announcement panel in the sample

When a new album is created in the store a notification is posted to all the connected browsers using SignalR.
Also added automation for the signalR hubs.

There is still some UI formatting improvements required in the way new arrivals are displayed. Will fix it in future checkins.
Adding SignalR components to the Ntlm based Startup class.

Missed to do this with previous checkin.
Adding all the Social login middlewares to the pipeline

Still some of the identity helpers have not lighted up. So it will not work fully.
Fixing the name of the APP_BASE environment variable to KRE_APPBASE (mono)
Updated to use the new target framework in project.json
Some cleanup

1. Removing a bug # from code which is fixed.
2. Removing a piece of test that was added while testing.
Updated build.cmd
Revert "Updated build.cmd"

This reverts commit cefc1e5bdde69cb2bdccb90a34f8cac83f4e249a.
Fixed build.cmd
Fixed CLR switching behavior in tests
Fixed bitness and removed 50
Adding some diagnostics to the Win32Exception

Kestrel variation seems to be failing for some reason. Adding some diagnostics.
Empty commit to fix CI
Adding in memory caching to the sample