Image Search Abstraction Layer

User Story: I can get the image URLs, alt text and page urls for a set of images relating to a given search string.

User Story: I can paginate through the responses by adding a ?offset=2 parameter to the URL.

User Story: I can get a list of the most recently submitted search strings.

To return the images sorted by most recent...

Example: https://powerful-badlands-5295.herokuapp.com/search/new/christmas

Response: [{"alt_text": ..., "page_url": ..., "link_url": ...}, ... ]

To paginate use the ?offset= tag...

Example: https://powerful-badlands-5295.herokuapp.com/search/new/christmas?offset=2

Response: [{"alt_text": ..., "page_url": ..., "link_url": ...}, ... ]