Add document widget overlay.
Merge remote-tracking branch 'origin/feature/Document-add-widget' into feature/Document-add-widget-overlay

Conflicts:

capacity4more/modules/c4m/restful/c4m_restful_quick_post/components/c4m-
app/src/controllers/drupalForm.js
Adding overlay path.
Adding prevent default to the event.
Merge pull request #330 from capacity4dev/feature/Document-add-widget-overlay

Add document widget overlay.