Merge pull request #162 from BluntBlade/master

同步更新
Update qrsync.md
add new document for qrsync v2
old => v1
Merge pull request #163 from rwifeng/patch-1

http://pm.qbox.me/redmine/issues/9883
resolve conflict
添加 579 响应码说明。
添加对 fops 参数中 ; 符号转义的说明。
Merge pull request #164 from rwifeng/master

qrsync v2 document
Merge branch 'master' of github.com:qiniu/developer.qiniu.com