(feat) changes to art.js, routes.js, and artServices.js; details below:

1. add generateArtInfo and generateRecommendations methods to routes.js in the server
2. adjust art service to make the proper http call
3. change art controller to pass the data.features to the $scope

Note: these methods may need to be refactored once we're working with real data, but they should work as intended.