Added a bit more info about mailchimp lists

(not really part of this story, was just hanging around, sorry)
Added crop search form to header
Added route for crop search
Added search method to crops

For now it just does a naive SQL LIKE query. We can make this fancier in
future, if we want to.
Added crop search controller and views
Fixed a bug that was deleting crops from the database!

Best bug of the night. TIL: don't call delete on an activerecord
collection expecting it to act like an array. D'oh!
Added sexy search button to navbar search box
Show crop thumbnails on search results page
Merge branch 'crop-search' of https://github.com/Skud/growstuff into Skud-crop-search

Conflicts:
	spec/models/crop_spec.rb