make sure we're testing all of EventsController#search.
initial extraction of Event::Search from EventsController#search.
move unknown event search warning to Event::Search object.
search result views should talk to the Event::Search object, not the params.
simplify handing of Event::Search ordering tags by score.
Event::Search is really defined in terms of four main attributes.
these controller specs should be unit tests for Event::Search.
Merge pull request #108 from botandrose/event_search_object

Extract Event::Search from EventsController#search