improve gplus tasks

See https://github.com/maiera/gde-app/issues/74

"Annotation" for reshares is now checked as well to be able to fix those posts where you can edit the original content

Bad posts are only bad if their associated AR don't have any activity types/product groups either, so fixing can also be done by editing the AR in the frontend.

If the #gde tag has been removed from the post it will be ignored for any updates or bad post checks.
I haven't implemented deleting it yet since there are some things to consider: 
-  What should happen if metadata has been added to an AR associated with the AP?
-  Do we do a full deletion or do we set a flag?