Bug in global navigation

[aitormf]

In global_navigation practice, I've tried to get robot orientation using self.sensor.getRobotTheta(). When I run the practice it gives an error. It seems that Pose3D doesn't have the yaw attribute. The error is:

Exception in thread Thread-2: 
Traceback (most recent call last): 
  File "/usr/lib/python3.5/threading.py", line 914, in _bootstrap_inner 
    self.run() 
  File "/home/vanejessi/Escritorio/Vanessa/TeachingRobotics/src/global_navigation/MyAlgorithm.py", line 36, in run 
    self.execute() 
  File "/home/vanejessi/Escritorio/Vanessa/TeachingRobotics/src/global_navigation/MyAlgorithm.py", line 267, in execute 
    orientationRobot = self.sensor.getRobotTheta() 
  File "/home/vanejessi/Escritorio/Vanessa/TeachingRobotics/src/global_navigation/sensors/sensor.py", line 78, in getRobotTheta 
    return self.pose3d.Yaw() 
AttributeError: 'Pose3D' object has no attribute 'Yaw' 

source

[aitormf]

merged #120