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.
Have we updated the wiki appropriately for getting a development environment up and running with Postgres?