[Feature] V3
[Changes] fix css style
[Bugfix] change text
Some Feature
[Feature] add qq link in header
[Feature] show general course when server down
[Feature] fix css and add new feature
[Feature] change img url to conn.wandouajia.com
[Feature] polish code
[Feature] change log key
[Feature] change help url
[Feature] add device_key
[Feature] add state and remove useless state
[Feature] change text && change help url
[Bugfix] encode device_key
[Feature] add start log
[Feature] add reboot computer
[Feature] add flash next button
[Feature] send log to vmap
[Feature] change state code
[Feature] add dx_guid to iframe
[Feature] change next link to button
[Feature] change png
[Feature] add i18n
[Bugfix]