First stab at ConservationStatus model.
Numerous updates to conservations statuses.
Bugfix: updating place geoms with multiple polygons was broken.
Made sure new statuses show on guide pages, lots of bugfixes.
Merge branch 'conservation_statuses'
Merge branch 'master' into i18n

Conflicts:
	app/views/listed_taxa/_guide_taxon.html.erb
	app/views/taxa/_form.html.erb
	app/views/taxa/show.html.erb