Attachment editor 3.1

Attachment editor v3.1 changes:

Fix bug where under certain conditions a user can edit another users attachment.

Attachment editor v3.0 changes:

Fixed issue with updating retina thumbnails.

Attachment editor v2.9 changes:

Fixed issue with preview image.

Attachment editor v2.8 changes:

Fixed issue with cache busting.

Attachment editor v2.7 changes:

Fixed issue where edited attachments changed order of attachment gallery thumbnails.

Attachment editor v2.6 changes:

Added two new user group permissions. It is now possible to allow Registered user group to use the add-on for their own posts.

Attachment editor v2.5 changes:

Updated template code. Dark variation now shows correctly.

Attachment editor v2.4 changes:

Fixed rotation direction when GD is enabled.

Attachment editor v2.3 changes:

Transparent backgrounds now retained.

Attachment editor v2.2 changes:

Fixed issue with image optimization and add border.