Implement the search API end-point.

Creates GET /api/v1/search&q=COOKBOOK_QUERY. Currently returns the cookbooks
with a similar name, description, category or maintainer. Search is currently
using Postgres full text search with the pg_search gem.

LeanKit Card: Super-20
https://chef.leankit.com/Boards/View/87539991/90240856
Merge pull request #165 from opscode/cookbook-search-super-20

Implement the search API end-point.