Checked out RoR and Heroku's documentation on memcache and low-level cache.Rails will low-level cache on the local machine in the development environment and I have set up the app to use memcache (with Heroku's memcacher addon) for it to work in the production environment. Have not yet tested

The below changes should be enough to make caching work on prod and dev environments.
Added wrapper div to the map, so I can manipulate it separately from the map div.

Moved some logic from controller to the model, in a quick method two_random_images to have the images link_to instagram. So users can find out more about any art they see.
Reduced amount of database calls I was making in the two_random_images method

Started playing with an arrow symbol. Still need to sort out the CSS
Merge pull request #9 from thomasgwatson/caching

Caching