Fixes #174 - loads ajax request only on /organizations

This is a patch for #174, but it's not perfect. The ajax request
happens twice when going from the homepage to the search results page
(see #175).
Simplifies organization routes

Organization routes was mapped to a resource, which expects a database
entity, which no longer exists. Therefore, the route has been
simplified to two get requests.
Removes reference to created_at

created_at field was used as a fallback for when updated_at field was
not present, but the updated_at field should always be present, even
when the record is first created (in which case it has the same value
as created_at).
Merges master
Adds formatting method for the updated_at field

update_at field was displayed as a timestamp on the details view. This
commit adds a field to format the field for friendlier reading.
Moves format_address functionality to a partial

This commit moves the format_addrese functionality to a partial so the
microdata elements can easily be included in all occurrences of the
address.
Merges master
Re-adds erroneously removed address method

Missed that this was used in the maps, it's been re-added.
Updates routes

updates routes per
https://github.com/codeforamerica/human_services_finder/pull/178#issueco
mment-20954763
Merge master
Merge pull request #178 from codeforamerica/bug-fixes

Bug fixes