Case insensitive search

Make crop search case insensitive (as per https://www.pivotaltracker.com/story/show/73517156).

We decided now is the time to make everyone switch to using Postgres in dev/test.  This turned out to be easier than expected!  Still need to document some of the finer details under Linux, though.
Yes, for OSX, and left a space asking someone to fill in Linux info when they get a chance.

> On 9 Jul 2014, at 6:22, Joseph Caudle <notifications@github.com> wrote:
> 
> In Gemfile:
> 
> > @@ -12,6 +12,8 @@ gem 'leaflet-rails'
> >  gem 'leaflet-markercluster-rails'
> >  gem 'unicorn' # http server
> >  
> > +gem 'pg'
> Have we updated the wiki appropriately for getting a development environment up and running with Postgres?
> 
> —
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