update the method signature for the 'changeVehicleMode' method.
increase visibility for VehicleMode class.
Merge branch 'master' of github.com:ne0fhyk/3DR-Services-Library
specified the direction in which the parameter for the 'changeVehicleMode' method is sent.
Merge branch 'master' of github.com:ne0fhyk/3DR-Services-Library
completed base implementation of the DroidPlannerApi.