Added some more tags to taxon links to support ranks.
Brushed up the taxon change updates a bit.
Altered the definition of whether a place contains an obs based on obs accuracy.
Played with a bunch of mobile web stuff, inc. image in obs form, neary obs, etc.
Merge branch 'master' into i18n

Conflicts:
	app/views/observations/add_nearby.mobile.erb
	app/views/observations/nearby.mobile.erb
	app/views/taxon_links/_form.html.erb