xunit now reports failure message that includes real details and the type of the error matches the original error instead of VowsTopicError
Merge pull request #113 from coreypobrien/xunit-topic-exception-reporting

xunit reporter should report full exception instead of just VowsTopicError
runner.utils: Print the function name when complaining about missing code

The exception message has had a %s marker since it was added in
0cefbe36 (Parallel running with inherited topics done, 2011-04-29),
but nobody ever set a value for that marker.
Merge pull request #114 from wking/function-name-without-code

runner.utils: Print the function name when complaining about missing code