Replace mongoid_search with ElasticSearch (via tire). Fixes #46

The keywords field has a boost applied to it, so that search results where the search term matches one or more keywords (aka categories) will appear higher

Location searches are sorted by distance, as are nearby queries.
Configure tire to use SearchBox on Heroku
Fix minor typo in README & comment in organization.rb
Add elasticsearch service to travis.yml
Merge pull request #76 from codeforamerica/elasticsearch

Elasticsearch