Merge pull request #162 from calonso-conabio/master

ranks translations
Bugfix: user url in curator change update email.
Minor change to private_geom migration to accomodate older versions of postgis.
Fixed legend issue on taxa/map.
Tried to improve listed taxon stats query a bit. Not much, but a bit.
Added rank selection in guide add taxa dialog.
Caught another exception for FlickrPhoto.repair.
Diff history for wiki pages.
Caught 404s and timeouts when requesting external taxon descriptions.
Made it impossible to delete a place if other people are using it for projects or guides.
Added paste to add taxa to guide.
trans