Implemented drawTrip, plot the trip given trip_id
implement cmd script for plotting single trip
Merge pull request #14 from shankari/gamification

Changed the gamified settings to real ones
Added documentation and comment
Added option -o and comments
Merge pull request #10 from ryanlei/patch-2

Implemented drawTrip, plot the trip given trip_id. This is part of the solution for issue #4.
Merge pull request #11 from ryanlei/patch-3

implement cmd script for plotting single trip.

This is the second part of fixing issue #4.