GUI-1079: Initial progress on allowing images to be de-registered
GUI-1079: Update dialog and menu items for image de-registration to match wireframe
GUI-1079: Fix failing tests
GUI-1079: Display "Remove from cloud" menu item on images landing page and image detail page only if the image is owned by the currently signed-in account
GUI-1079: Use "and" instead of all() for delete_snapshot check
Merge branch 'develop' into GUI-1079

Conflicts:
	eucaconsole/templates/images/image_view.pt
GUI-1079: Disable "delete snapshot" field in "remove from cloud" dialog on the image detail page when a snapshot has multiple images registered
GUI-1079: Disable "delete snapshot" checkbox in de-register modal on images landing page when other images are registered from the image's snapshot
GUI-1079: Wrap IAM conn get_user() call in standard error handler
updated dialog text to indicate image can be re-registered if associated snap is still there
Merge pull request #792 from eucalyptus/GUI-1079

GUI-1079: Allow images to be de-registered from the cloud