new top-bar navigation design

The patch include some design and usability changes
* A new top-bar navigation.
  * The new navigation doesn't include the bookmarks as shortcuts dropdown.
  * It includes a new organization/location switch.
  * The user menu moved to the top left side. 
* A new login page design to fit the new top bar design.
* The multi-select action buttons on the host page was replaced with an action
dropdown to better fit smaller screens.