Update README.md
Merge pull request #4 from picasso250/patch-1

Update README.md PHP 语法高亮
fix Wechatext auth unavailable, fixed issue #5
fixed snoopy https request bugs.
add getRevVoice() support
add get message interface, include  get new message num, fetch jpg
msg data and voice data.
fullfill README and comments.
update README
add logout
delete not recommend function
add sendNews/sendImage/sendAudio/sendVideo support for wechatext
edit readme
fullfill readme
add sendNews/sendImage/sendAudio/sendVideo support for wechatext
send News preview msg to library
add getNewsList and getFileList from library
fixed strict bugs for issue #11
Merge branch 'refs/heads/master' of https://github.com/dodgepudding/wechat-php-sdk.git
修改错别字
空格全部转为tab