Merge branch 'master' into features/octorun-js

# Conflicts:
#	src/GitHub.Api/Authentication/Keychain.cs

Author: StanleyGoldman

src/GitHub.Api/Authentication/IKeychain.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Threading.Tasks;
 
 namespace GitHub.Unity
@@ -17,5 +18,7 @@ public interface IKeychain
         bool HasKeys { get; }
         bool NeedsLoad { get; }
         void SetToken(UriString host, string token);
+
+        event Action ConnectionsChanged;
     }
 }