Update ThirtySevenSignalsProvider.cs

capture refresh token
BugFix: Nancy module was incorrectly returning the wrong referrer url. :blush:
Added a WorldDomination.Web.Authentication redirect ReadMe.txt
- Create a readme asking people to goto SA.
- New NuGet package which only opens up a readme.
Merge pull request #108 from PureKrome/master

BugFix: Nancy module was incorrectly returning the wrong referrer url.
Merge pull request #106 from kijanawoodard/patch-1

Update ThirtySevenSignalsProvider.cs