2014/08/19 Huge Update
Add:
* HOWTO-config-zh_CN.md : config.php guide
* lang/lang.list : language list

Modify:
* *.php : delete "?>" at the end of file
* function.common.php : CDN feature improved
* functions.upload.php : Watermark feature added
* config.php : new paraments for CDN and Watermark feature
* engine.php : config.php check function
* install.php : WIP install interface
* themes/default/ui.js : fix a little mistake