[#964] ByteBuf.readLine() must return null when no more data is available in ByteBuf
*ChannelBuffer* -> *ByteBuf* and ChannelBuffersTest -> UnpooledTest
Bootstrap thread safety

Changed options and attrs from LinkedHashMap to ConcurrentHashMap to
avoid a possible ConcurrentModificationException if a thread was
adding/removing options/attrs while another was calling Bootstrap.init()
or Bootstrap.duplicate()
[#972] Correctly mark the ChannelPipeline once a ChannelHandler was removed and because of this a buffer was freed
Revert "[#972] Correctly mark the ChannelPipeline once a ChannelHandler was removed and because of this a buffer was freed"

This reverts commit 4ac3bace0f0578f8b84b3d3a2334d36448447f37.
[#976] Fix exception which will be raised by ChannelInboundHandler.discardInboundReadBytes() and ChannelOutboundHandler.discardOutboundReadBytes() if the handler remove it self from the pipeline
[#977] Stop processing messages/bytes in a loop when the handler was removed from the ChannelPipeline
[#973] Use static IdleStateEvents to reduce GC pressure
Disable test as this let fail the build 80% times on osx and slow linux servers. Need to investigate
[#986] DefaultChannelHandlerContext.fireUserEventTriggered(...) uses correct ChannelHandlerContext now