Editor styling in line with mock-ups
Remove redundant comment
Generic context menu creation
Updated stlying for context menu
Re-worked event order to correct paste issue

Re-worked pre-block paste zone.
Closing the editor contextMenu on a click
Added 'editable' class to page items

Articles, blocks and components now have an 'editable' class.  Also, a
hover effect is added when these moused over.
Moved 'paste-cancel' handling to EditorOriginView

Also fixed propagation bug with openContextMenu().
Slight change to the dashboard

Now returning the last updated date and handling refreshing the data when
a project is deleted.
Switched the menu editor to horizontal

Basic styling applied -- re-work still required.
Merge branch 'develop' of github.com:adaptlearning/adapt_authoring into basic-styling

Conflicts:
	frontend/src/core/app/app.js
	frontend/src/core/dashboard/views/dashboardView.js
Removed .editor-menu-layer border styling

This was causing an issue where the top border grew with every menu layer
added.
On-going re-work to menu editor

The menu editor now dynamically persists the ID of the item being edited
in the address bar.  As a result the 'Back' button functions as expected
and the 'Add page/section' buttons add to the correct column.
Removed console.log() from EditorContentObject

Also removed the event listener for 'change:_isSelected' as this wasn't
doing anything.
Merge pull request #322 from adaptlearning/basic-styling

Basic styling