Made date range filters time-specific.
Experimenting with a list filter for observations, more links for obs stats.
Require auth for obs/index requests of pages higher than 100.
Try to overselect taxon searches to increase chances of getting exact match first despite obs count order.
Merge branch 'master' of github.com:inaturalist/inaturalist

Conflicts:
	public/javascripts/translations.js
Cosmetic changes.