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

1. add generateArtInfo and generateRecommendations methods to routes.js in the server
2. update artServices.js to include the correct $http parameters
3. update the art controller to pass 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.