Merge pull request #1534 from DroidPlanner/default_imperial_speed_unit

Changed the default speed unit from ft/s to mph.

Android/src/org/droidplanner/android/utils/unit/providers/speed/ImperialSpeedUnitProvider.java

@@ -11,6 +11,6 @@
 public class ImperialSpeedUnitProvider extends SpeedUnitProvider {
     @Override
     public SpeedUnit fromBaseToTarget(MeterPerSecond base) {
-        return Operation.convert(base, UnitIdentifier.FOOT_PER_SECOND);
+        return Operation.convert(base, UnitIdentifier.MILES_PER_HOUR);
     }
 }