VE-389: set up initial panel layout for the media insertion tool.
Merge branch 'dev' into ve-sprint-4
Merge branch 've-sprint-4' into VE-389
VE-389: implement PagedLayout inside the MediaInsertionDialog.
VE-389: udpate CSS to match new DOM structure.
Merge branch 'dev' into ve-sprint-4
Merge pull request #1683 from Wikia/VE-389

VE-389: implement panel layout for the media insertion dialog
Basic setup of WikiaMediaInsertDialog (contains cart and search widget)
Undo
New response structure based on team feedback
Add "random" results to the cart when items in the search results are selected
fixing xml results
Video (vid-911): VideoPageTool - update publish date
VID-790 adding breadcrumbs to the top of the video page admin form
removing unused code
Localisation updates from http://translatewiki.net.
VID-917 fixing scroll bar on video home page
removing unnecessary semicolons
VE-391: create WikiaMediaSearchWidget (from MWMediaSearchWidget).
VE-391: add widget to resource loader.