Update FullHttpMessage.java

I think FullHttpMessage = HttpMessage + LastHttpContent,
not that FullHttpMessage = FullHttpMessage + LastHttpContent
Fix logging of android platform detection
Fix a few typos
Allow to get an Iterator over all of the EventExecutor an EventExecutorGroup contains. Beside this allow to get basic stats for the EventExecutor like pendingTasks and executorCount
Merge remote-tracking branch 'upstream/master'