Use relative URLs for chooser

Fixes issue with choosers not working on HTTPS
Merge pull request #95 from md5/https-chooser

Fix choosers under HTTPS
Fixed #98
Restricted requests to /comments to html responses.
Layout bug with form labels.
Bugfix: image path was broken in new user email.
Added confirmed_observations_count to list csv exports.
Bugfix: layout of listed_taxa/show had a translation bug.
Added unconfirmed_observations_count to list csv export.
Made sure LocalPhotos get native_realname set when available.
Bugfix: not all places with boundaries have bbox_areas apparently.
Bugfix: project contributor stats were all showing the same stat.