VE-600 and VE-122 adding error messages when uploading media
JSDoc and Whitespace
VE-122 permission denied error for users that aren't allowed to add images/videos
adding a todo for later
adding a todo for later
VE-122 following earlier conventions
JSHint
Merge branch 've-sprint-7' into VE-600-non-premium-error-message
Merge pull request #2178 from Wikia/VE-600-non-premium-error-message

Media insertion error messages