gps_spec GPS.set

Sets a robot's x,y coordinate position.
implement Robot#at
implement GPS.set
implement coordinates reader method. Robot#coordinates
robot_spec Robot#advance

Given, an coordinates and an orientation, instructs the robot to advance forward.
implement Robot#advance
gps_spec GPS.coordinate

Given a cardinal direction, it returns the gps coordinate.
implement GPS.coordinate
gps_spec GPS.adjust_coordinates

Given a cardianl direction, it returns the robot's new coordinates.
implement GPS.adjust_coordinate
simulator_spec Simulator#instructions

given a string of instructions, it creates a list of commands to give the robot.
implement Simulator#instructions
simulator_spc Simulator#place

Given x and y coordinates, it places the robot in the grid.
implement Simulator#place
simulator_spec Simulator#evaluate

Gives the robot a set of instructions
implement Simulator#evaluate