GUI-62: Restore Dashboard link in top nav.
Update Foundation JS to version 5.0.3
Remove rounded corners for buttons on login page for consistency.
GUI-362: Revamp top nav styles.  Fix user/region dropdown menus.
GUI-62: Implement off-canvas nav for small-screen view.
Merge pull request #162 from eucalyptus/GUI-62

GUI-62: Navigation Revamp