snippets
Start integration of snippets into UI
Adds basic snippet UI integration

Includes all snippets partials.
Update Popover method naming
Add snippets dropdown menu and enable more snippets
Close menu on snippet insert
Restrict width of toolbar dropdown menu
Improve hover and active state of toolbar buttons
Bump mas-cms-editor version

Includes enabled line breaks in marked
Add new line below each snippet
Vertically align toolbar buttons
Only allow snippets to be inserted within on a new line

i.e. within an empty <p> tag on a new line
Add disabled state to .menu component
Fix error where opening snippets menu then clicking into editor

Caused by `document` being returned as the `parentElement` of the
current node.
Lint Popover
Add outline on toolbar buttons
Close snippets menu on blur
Add table snippet
Add missing _initialisedSuccess callback to fix Cucumber tests
Add test for Popover closeOnClick

Also removes unncessary keyup evet