Remove an irrelevant comment

.. because firedChannelActive is gone long ago
Remove all/target/src and all/target/classes after building the all-in-one JAR and Xref

.. so that IDEA does not add all/target/src  and all/target/classes to the source and class path.
Grammar
Use recyclable write task to reduce GC pressure
Small optimization in DefaultHttpHeaders.clear()
[#1690] Correctly return first header value on DefaultHttpHeaders.get(..)
[#1704] Make sure SwappedByteBuf.readSlice(..) returns ByteBuf with correct ByteOrder
Allow to also write FileRegion and ChunkInput when using HTTP chunked. Fixes [#1693]
Correctly update Channel.isWritable() when the write happens from outside the EventLoop in a fast fashion. Fixes [#1697]

Introduce a new interface called MessageSizeEstimator. This can be specific per Channel (via ChannelConfig). The MessageSizeEstimator will be used to estimate for a message that should be written. The default implementation handles ByteBuf, ByteBufHolder and FileRegion. A user is free to plug-in his/her own implementation for different behaviour.
Allow to have the Channel GC'ed ASAP
[#1707] More efficient implementation of ChannelHandlerContext.writeAndFlush(..)
Share some code, related to [#1707]]
[#1708] Correctly set the writerIndex in ReadOnlyByteBufferBuf if it is constructed with a buffer which has non zero position
[#1709] Correctly detect that Unsafe.copyMemory is missing
Make sure ChannelOutboundBuffer not throw NPE during increment/decrement pending writes
[maven-release-plugin] prepare release netty-4.0.7.Final
[maven-release-plugin] prepare for next development iteration
[#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