Released gnet v1.4.0

#Features

• Support TCP_NODELAY socket option 525df8
• Implement the lock-free queue for dispatching tasks faster #181

#Enhancements

• Shrink the ring-buffer for saving memory 14fd04
• Improve event poll fc042c
• Improve the buffered channels 83b96e
• Shrink the poll event list when it need to 158763
• Improve the I/O in event-loop c554f4
• Prioritize writable events 0f08c8
• Make it more robust when running async jobs 6509b8
• Improve the poller waking logic 4d8acc

#Bugfixes

• Re-enqueue the subsequent jobs when a error occurs 1af3f6
• Close and release a socket when error occurs 9d86c9
• Check outbound buffer in case the socket has been released 035f61
• Avoid starving sockets e31525

#Docs

• Enrich the doc about using UDP packets 0047c1
• Add more user cases of gnet 076b16
• Update benchmark results 028bab
• Update the description about ring-buffer 38b086

#Misc

• Add one more donor 12bfa5
• Refine code 2aee5a
• Add comments on those core code 2404ed
• Refine code and add comments 4ecbc5
• Add a warning comment for OnOpened 0bddd0