workers option is passed to tests correctly when set to zero #121
Merge branch 'issue-121' into issue-75
Merge pull request #122 from nunit/issue-121

workers option is passed to tests correctly when set to zero #121
Merge remote-tracking branch 'origin/master' into issue-75
Display test harness NumWorkers option when not null
Merge branch 'master' into issue-75
Added missing compiler conditional for .NET 4.0
Throwing inner exception rather than target invocation exception, which is wrong
Ignoring assertions on async exception messages for pre-.NET 4.5