Merge pull request qiniu#318 from qiniu/develop

Develop

Merge pull request qiniu#308 from qiniu/develop

delete checkCrc

Update Config.php

fix the rs, rsf https domains for different regions

prepare to publish 7.2.4

fix uc domain problem

fix http header case sensitive problem

Merge pull request qiniu#250 from jemygraw/master

give up the php5.3 test because the travis environment is down

remove the print debug message

Merge pull request qiniu#241 from jemygraw/master

use `phpcs --standard=PSR2` to fix the code style

add changelog