Merge pull request #1043 from thecodejunkie/xunitupdate

Updated xunit to latest stable
Fixed broken xunit reference
Fix typo
Merge pull request #1045 from jugglingnutcase/patch-1

Fix typo in Browser.cs
Fix issue with login request helper

Any POST to the diagnostics app was being treated as a login request.
Merge pull request #1048 from jugglingnutcase/diagnostics-login-fixes

Fix issue with login request helper. Fixes #1047
Changed MoveStreamOutOfMemoryIfExpectedLengthExceedExpectedLength signature
Brought in changes for #1034
Improved request stream copying
Added XML comment