Squashed commit of the following:

commit a8fa007e5d5f2fae17689518ad6b2da7953b3aee
Author: davismartin <davisshippmartin@gmail.com>
Date:   Fri Dec 6 12:00:07 2013 -0600

    Adds trip_distance method WITH COMMENTSS

commit cf1dc993a6500333c11fd4df5763374bc23d9d93
Author: davismartin <davisshippmartin@gmail.com>
Date:   Fri Dec 6 11:54:58 2013 -0600

    Adds trip_distance method