Implementation of toString() in Coordinate class
Updating data set
Implementation of a Ride class to gather coordinates associate to a ride.
Suppression of Trace (previous commit) and moving the timestamp in Coordinate class. That's make more sense according the Android Location object.
Splitting of loadData() (creating of parseJSONTraces()) and implementation of splitIntiRides() to identify different rides
Correction of a minor bug in splitIntoRides() calling (data -> user parameter)
Computing of the average speed and the total distance of each ride
Removing of the computeDistance() function (now in Coordinate)