Implements "Add Images" feature to the card creation process.
Implementation uses google-search gem to retrieve three images from
Google using the front of the card as the query term.

Initial implementation of Add Images
Amends redirecting through Cards#create
Refactors the Add Image feature
Fix Hound comments
Added functionality to tag decks
Cleaned up syntax
created private find_tag method
altered tagging functionality
Refactoring Add Images
Merge pull request #3 from thisismetis/dk-image-search

Implements "Add Images" feature to the card creation process.