- added a nuspec for this new 2.0.1 version (avoiding bloating the repo with additional binaries as when adding nupkg files directly.

- reverted the referenced jquery version back to the SignalR 2.0 minimum, which is still 1.6.4 for maximum compatibility.
- updated Microsoft.Owin.Security to 2.1.0 and Owin to net45
- updated Newtonsoft.Json to 6.0.3.