Fix thumbnail select

1. newsAdd: use makeUrl wrongly
2. newsEdit: use makeUrl instead of direct url
Merge branch 'master' of git.oschina.net:luohao-brian/phonecms
Make thumbnail select function as a widget

Use it in newsAdd & newsEdit page
Make hidden input configurable in thumbnail widget

And update the news action
Use thumbnail select widget in userAdd/userEdit
Use thumbnail select widget in categoryAdd/Edit
truncate chinese string
Add action.rest
Merge branch 'master' of http://git.oschina.net/luohao-brian/phonecms
Add htmlunquote back to action.base