add Interest class and interests_profiles join table
add functionality to create interests
add functionality to show individual interest pages
add functionality to add interests to profile when they're created or edited
add functionality to edit interests
add functionality to delete interests
display form validation errors when creating or editing profiles and interests
add Bootstrap to project and style flash messages
add styles to header and forms
add rails12factor gem to deploy on heroku
enable pre-compiling of assets to to deploy on heroku