add username to h1 on users rides index page
DRY up markup for displaying an instance of Ride with _ride partial
set belongs_to :user on Ride
set instance variable for username when showing a ride
display who posted the ride when showing it
remove users/rides_controller's show method, rides_controller's show handles everything fine
remove users/rides_controller's new method, rides_controller's new handles everything fine
remove users/rides_controller's edit method, rides_controller's edit handles everything fine
update path to destroy link on user ride show