fixes rubocop's incorrect suggestion on a render and return
adds integration tests for art files & includes fixes for failures
adds ending newline to files
adds newline to end of file
updates styling/syntax per kerri's suggestion
Merge pull request #12 from kotisdesign/art_files_tests

Art files and omniauth callback tests and fixes
creates session variables and controller methods for user info provided by API
displays a not authorized message for users w/o access
stylized flash messages, app layouts, not-authorized page
adds line break at bottom of users.css file
moves access denied path and role validation into app controller
moves user session info to an object
removes UserSession object from app controller and into art_files
updates first_name/last_name in model if modified from KotisAuth
merge conflict resolution