Entities index API backed by Elasticsearch

Using the query language as here:

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-query-string-query.html
Merge pull request #145 from MastodonC/feature/search-and-filtering

Feature/search and filtering
User registration form, routes and handling.
Merge pull request #147 from MastodonC/feature/user-registration

User self registration
Add k.h.d.entities/get-entities-having-location.
Add boilerplate for property_map.
further js gymnastics.
wip.
wip
some css fanagling. (still looks crap).
when will the css wrangling end. looking less crap.