added controller and factories for route_users
added test for route_users#new behaviors
created form for logging a flight
updated routes index to show a table of all routes shown
added link to add route to user's flight log
added distance in miles to route
added additional units of measure to route#distance
added miles to route model
fixed bug in reverse geocoding airports
added link to routes on airport page
added test for airport departing routes content
added route info to /route_users/new
added create method to route_user
added features to create new route_users from views
added route info to user#show
added distance and map to user spec
implemented '#destroy' on RouteUser
added 'delete' buttons to 'user#show' for removing routes flown