Image Search Abstraction Layer

User stories:

1. I can get the image URLs, alt text and page urls for a set of images relating to a given search string.
2. I can paginate through the responses by adding a ?offset=2 parameter to the URL.
3. I can get a list of the most recently submitted search strings.

Example usage:

Search images:
https://img-search-ms-343dev.herokuapp.com/api/img-search/lolcats%20funny?offset=10

Recent search queries:
https://img-search-ms-343dev.herokuapp.com/api/img-search/