UI-2376: Gadget stylesheet
Fix ajax submit form of user management component
Add checkAll checkbox to user selector
UI-2399: CLONE - [PLF 4] GateIn - Group Selector
BD-1330 [PLF 4] GateIn - Manage Sites
BD-1332 [PLF 4] GateIn - Manage Site - Edit Navigation
BD-1333 [PLF 4] GateIn - Manage Group Site