Added httparty, to make get requests a breeze
Fixed up spec after response object changes
Added forbidden column for Entry table, to keep track of which images are still available
Added forbidden_check method as an after_create callback. Forbidden check sends a GET request to instagram/facebook servers to check that the image is still accessible, thus avoiding broken image links.

Adjusted feed and random image methods to ensure they only returned non-forbidden entries

Created broken_image_begone to scream through the initital database and check whether an image was forbidden or not.
Merge pull request #33 from thomasgwatson/broken_image_begone

Broken image begone