Merge pull request #49 from AEgan/egan-dev

I think we'll be fine having the rider model inside the carpool model.  Not a huge deal to have them in separate files.
add rider page only shows riders who are not on the ride yet
adds checkboxes to add riders
refactors riders.js file, adds comments, changes the method it uses to create instead of the test method I was using
when you add a carpool your children are added as riders
ride request is in place but it will not work without being able to tie it to an event
you can create a ride request for a carpool
adds confirmation status to carpool show page