update example files.

Merge branch 'master' of github.com:swoole/swoole-src

fixed async udp client error.

fix swoole_async_write core dump on PHP7. Fixed swoole#501

use malloc_trim

fixed swoole#481.

fix websocker server lost 2 bytes.

disable swoole_http_client, Fix swoole#461

fix SWOOLE_KEEP connection leak.

concurrent Asynchronous mysql client