Made the people resource a nested resource of booking #4

This will allow for urls of /booking/:id/people/:id. Also it lets us
create new people that are attached to a booking.
Updated gitignore with a common rails ignore #2

Also removed the database from git since it should have been ignored.
Updated the Models and Controllers to support the nested people #4

The people controller and booking model have been updated to support
the nested people resource inside of controller.
Update views to display the correct links #4

The views will now display the correct links that use the nested people
and bookings resources.