WL-3501 Add plugin for easily embedding jQuery library on editor page
WL-3501 Add jquery plugin to plugins lineup
WL-3501 Apply fixes to match current wl-ck-plugins fix-oxitems branch

* Fix webelarn.ox.ac.uk urls
* Fix references to editor for embedAssetsInEditor
WL-3501 Fix itemsearch and file tree
WL-3501 Fix oxitems display problems
WL-3501 Fix control loop
WL-3501 Fix css issues for itemsearch in Chrome
WL-3501 Fix css chrome issues for itemsearch on youtube
Merge pull request #52 from ox-it/WL-3501

WL-3501 Add wl-ck-plugins to editor