allow user to add comments to idea
allow user to add comments to idea from the idea#show page
destroy the comments if the associated idea is destroyed
aesthetic updates to ideas#index and ideas#show
create tags model
allow user to see all tags and create tags
allow users to tag ideas
allow user to delete tags from the idea#show page
allow user to delete ideas with confirmation dialogoue
create a show page for tags to eventually show all ideas that have that tag