Production push: crop search, backend upgrades, roots/tubers, map fixes

This release includes the following changes:

* Crop search - you can now search for crops through a search box in the top navbar
* Roots/tubers - you can now plant things from roots/tubers (eg. potatoes)
* Map fixes - we have switched map providers from Cloudmade to Mapbox
* Backend upgrades to ruby 2.1.1 and various improvements to how we manage our config variables