Basic CKEditor integration.
Added image uploads to the CKEditor through AttachedFiles; Added more CKEditor plugins into the code base just because it's nice to have.
Skipped CSRF authentication for CKEditor upload because it would cause the user to log out.
Merge branch 'master' of github.com:rafrafgit/coach into ckeditor
Added syntax highlighting widget to CKEditor with highlight.js.
Added a highlighting div (with class "alert") to CKEditor (#2).
CKEditor: added mediaembed plugin to allow embedding iframes of videos and forms. Changed the icon for the code widget and updated its text. Added ShowBlocks button.
CKEditor: default link target is now "_blank" (#1).
Adding weeks to courses
merge conflict