Merge pull request #121 from bixuehujin/enh-osx

Added system configurations checking for os x before server start
Added tcp_nopush option.
Merge branch 'master' of github.com:swoole/swoole-src
Typo fix
Merge remote-tracking branch 'upstream/master' into enh-osx
Make SW_BUFFER_SIZE to be 2K on OS X