move faceting code to its own module
display titles of facet terms in UI
urlencode facet terms so multi-word terms work right
use urlquote instead of urlencode

urlencode is for key:value pairs rather than single strings
Merge branch 'master' of https://github.com/densho/ddr-public
only show certain facets on browse page
only load sub-objects once
collections list page

Lists organizations and their collections
index page is just links to collections, browse, search
object .absolute_url() functions
objects link to parent
repo and org detail pages redirect to /collections/