DashEditView: fix for small ui bug, when having dashboard settings view open and entering panel edit mode, did not cause dash edit view to be closed

Enforce domain, host header validation against domain setting, Refactoring of PR #1866, Closes #1732

HTTP API: GET /api/dashboards/db/:slug response changed property  to  to match the POST request nameing, Fixes #1928

Auth: Support for user authentication via reverse proxy header (like X-Authenticated-User, or X-WEBAUTH-USER), Closes #1921

Organization: You can now update the organization user role directly (without removing and readding the organization user). Closes #1899

Final polish on panel & row repeats, #1888, still some missing places where scopedVars needs to be used

Templating: Support for search filtering and keyboard up/down filtering in the new multi variable value selector dropdown, #1144

Fix the first CLA link.