Merge pull request #115 from calonso-conabio/master

translations
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Added tag help to guides, previously used tag buttons.
Added counts to taxonomy navigation on guides.
Tested some of the obs stats endpoints, added API doc tool.
Ensure taxon_id takes precedence over taxon_name in observation requests.
Translation bug.
Tested and redocumented nested observations field values in POST /observations.
Documented and tested comments API.
Documented and tested identifications API.
Bugfix: guide PDF generation was broken.
Format restriction for obs/edit.
Added named ancestor to taxon name display when no common name.
More anti-spam message measures.
Dumb spec fix.
Linked to project invitations manager from projects/:login.
TaxonChange comments didn't have good update taglines.
Bugfix: Nested observation_field_values weren't updating based on observation field id or name.
Added creator and updater to taxa/edit.
Added user and taxon icons to obs/show.json.