Initialization
The automatic generation of the intial population in ramp_planner is done
TODO:
Create a SubscribeAndPublish class in trajectory_generator
Make a better way for the ramp_planner to publish and obtain trajectories
   -Maybe a PublishAndSubscribe class?
   -Put IDs on TrajectoryRequest.msg and Trajectory.msg?
Start working on modification operators (insert, delete, swap, etc)