Update ef version, rebuild migration for adding User's RawPreferences
Merge pull request #949 from JabbR/ef

Update ef version, rebuild migration for adding User's RawPreferences
Updated to the latest katana stack.
Updated to the latest SignalR
- Change to use the new multisend feature
Reduced feeds required in NuGet.targets
Updated to the latest EF.
Updated katana and Signalr to latest.
changed header styles to make the current room more clear, simpler
fix hover style on inactive tab message received, make headers pulse properly again, remove opacity from inactive tab text
fix interaction of dropdown and inactive tab pulse
Merge pull request #951 from JabbR/css-fix

Make active tab more emphasised, other css changes for tabs
fix encoding issue with notifications user/room/date tagline.
Add encoded flag to processContent to account for us getting html entities in the javascript strings from notifications.  This prevents us from double encoding everything.  Should fix #948
Merge pull request #953 from JabbR/notifications

Fix #952 and #948 by encoding metadata for notifications
Updated to latest signalr to fix issues sending notifications to offline users.
Changed GetRoomInfo and GetPreviousMessages to be async.
Make GetRooms async.
Update to the latest nightly katana and signalr
Updated to latest EF nightly
slight improvements to imgur content provider to not try to imagify /a/ links (album), to use https on imgur rather than a proxy, and to allow for https links to be used.  Still breaks on things like imgur.com/random and imgur.com/gallery/myAlbumName (as we can't differentiate these from valid images without using the imgur API)