FIX Not being able to remove, add or edit the caption on an image properly
FIX TinyMCE context menu displaying default dialogs instead of our one
Merge pull request #1149 from silverstripe-rebelalliance/bug/image_reedit_attr

FIX A couple of bugs integrating the SilverStripe media panel with TinyMCE
FIX Assiging width to caption instead of container
Merge pull request #1151 from silverstripe-rebelalliance/bug/image_reedit_attr

FIX Assiging width to caption instead of container