Fix testTCPClientDisconnectImmediately failed bug : DNSResolve::Cance…

…l bug. Fix EventLoop::QueueInLoop notified_ bug. see Qihoo360#15 Qihoo360#12

Release version 0.2.4

A benchmark optimized test code release

A benchmark test code release

Release version 0.2.2 : Refactor some codes

Release version 0.2.1 : Fix evnsq reconnect to NSQD coredump

Fix a bug : Qihoo360#2 . Thanks https://github.com/ivanabc

Performance improvement : Use gettimeofday to replace std::chrono::system_clock

The first release version