Merge flowbar to riversyang, disable ga object temporarily, correct style.less file.
Add Upaiyun image upload function.

Need to run bower for the first time.
Refactor upload function for 'development' env.
Enable client global js var GLOBAL_ENV_MODE.
Comment out jquery-file-upload function, use UpaiYun upload instead.
Hide error message area once upload success.
Comment out unused code and fix bug of UpaiYun upload result's JSON parse error.
Merge UpaiYun upload function from 'riversyang'. (Many changes.)