Add host model, and inside Show model, change sign_up_day:string to sign_up_days_before:integer
Add working inputs for show information to venues/_form.haml
Add working form to make host name appear in the hosts table upon form submission
Remove host_id from Show table
Add working fields for host inputs
Add @show.booked_spots, @host.first_name and @host.last_name to venues/show.haml
Add remainder of show information and host information to venues/show.haml
Add mail_to @host.email on venues/show.haml
Add default values to text inputs on venues/form.haml