add groups table
initial group model with associations and validations
associate groups on the user model
move correct_user and signed_in_user to sessions helper
add paginate since we'll need to for groups
Backend for showing groups on user show
group controller with create
routes for groups
clean up forms
group partial for throughout the site
add size keyword argument to gravatar helper
display groups on user show view
group form and user info partials
render out form and user info on home page
wire up group creation on home page
add some styling for the groups
use .count instead of .any? since it doesn't play nice with build
wire up destroy action
add delete button to group partial
set up group show page properly