support add/remove perm to/from role (html,php part)
support update selection menu of role-perm association (js part, 1/2)
support update selection menu of role-perm association (js part, 2/2)
support update selection menu of role-perm association (js part, almost all completed)
support update selection menu of role-perm association (api part, almost all completed)
change layout of role-perm association menus