Add support for contextual links

I'm actually a little surprised that entity_translation doesn't automatically add contextual links for translate via hook_menu or hook_entity_view_alter() so that it's not the responsibility of the individual modules to add this contextual link. Could we file a feature request against entity_translation or figure out a way to pass entity contextual links into $block->admin_links?

After investigation, we can do better to support contextual links from within Fieldable panels panes. Entity translation actually does a good job and tries to add the 'Translate' as a contextual link, but we don't support showing it.

Please test the following patch.

Revised patch to prevent contextual links on the admin/structure/fieldable-panels-panes/view/[id] pages and revised documentation.

Tested and committed #4 to 7.x-1.x.
http://drupalcode.org/project/fieldable_panels_panes.git/commit/9a8ca12

I appeared to have cross-posted with myself...