Squashed commit of the following:

Add a method to calculate trip distance.

[Closes #1]

commit cd9d12d94a907d65b4440f9b22edd60be52b6aa2
Author: MakerSquare Student <students@themakersquare.com>
Date:   Tue Jul 23 11:31:33 2013 -0500

    Added a comment in order to est out the git diff command

commit 2756e2f712e1c6c4396c31671857d74235aeabf6
Author: MakerSquare Student <students@themakersquare.com>
Date:   Tue Jul 23 10:30:14 2013 -0500

    Added the trip_distance method, as per Gene's demand.

commit 7c29458539e1420051dfb126307b70660d986ef1
Author: MakerSquare Student <students@themakersquare.com>
Date:   Tue Jul 23 10:13:35 2013 -0500

    remove extra end

commit c8a1141f015395ec709effec6a9222e1ea50b729
Merge: 6f56503 c759d60
Author: MakerSquare Student <students@themakersquare.com>
Date:   Tue Jul 23 09:52:13 2013 -0500

    commit for b

commit 6f56503d85723995121738180c69f230564fb680
Author: MakerSquare Student <students@themakersquare.com>
Date:   Tue Jul 23 09:38:03 2013 -0500

    Add trip_duration method after initialize