First cut at introducing new result states: ChildFailure, SetUpFailure and TearDownFailure
Fix async test errors in 4.0 and 4.5 build
Fix error in converting output to nunit2 format
Add Site property to ResultState; create new standard ResultStates; get ResultStates from the Exceptions thrown by Assert.
Fix for issue #256
Merge pull request #277 from Codercamp/issue-256

Fix for issue #256
Replace overloaded + operator with fluent property WithSite
Merge pull request #263 from nunit/issue-255

Issue 255
Merge branch 'master' into issue-264