Cache image URLs by album in a flat file so wok doesn't hit the APIs every refresh

[ngokevin]

Flickr's API is damn slow, takes so long to deploy a wok site with Flickr albums. Let's cache.

• Check for the existence of image URL cache (could be a json blob with album IDs as keys).
• When pulling in image URLs, update the json blob if the album doesn't exist.

Something like:

    'albums': ['flickralbum1sadkasdaa', 'imguralbumdakfwef', 'flickralbum2lkfa'],
    'flickralbum1': ['img.jpg', 'img2.jpg']
    'flickralbum2': ['img.jpg', 'img3'.jpg']

When you want to bust the cache, you would open up the json file and delete an album from albums, and Sriracha should update the album.

[ngokevin]

done baby