[#1692] Allow to set WRITE_BUFFER_HIGH_WATER_MARK and WRITE_BUFFER_LOW_WATER_MARK via ChannelOption
[#1711] Allow to use ChannelOption for set / get MessageSizeEstimator
Disallow usage of maven 3.1.x (and higher) because of non compability with plugins
Tiny optimizations
[#1714] Make sure ByteArrayDecoder also works correctly with pooled buffers
Remove unused package private method and so remove some complexity
Move method in correct scope
Merge remote-tracking branch: upstream/master