PortHoleDetector: remove unnecessary class prefix
FourLetterCommandHandlerTest: unknown commands
FourLetterCommandHandlerTest: burp leaves pipeline empty
test Message.ByteBufToMessageDecoder
SimpleStatisticsReporter: remove unused toString()
ByteBufs: don't bother hiding constructor

Breaks code coverage, no point.
ByteBufsTest: cover the constructor
FourLetterCommandTest: string representation, for coverage :)
StatisticsReporter: reorder methods by params
SimpleStatisticsReporter: handle large messages properly
SimpleStatisticsReporterTest: test counters
Merge pull request #15 from airbnb/pierre/test_the_tests

Test the tests