Adds self.detector to prpy.base.robot.

This mirrors `self.actions` and `self.planner`.  However, if this attribute is removed, f1fb21b will still prevent an infinite recursion.

Author: psigen

src/prpy/base/robot.py

@@ -45,6 +45,7 @@ class Robot(openravepy.Robot):
     def __init__(self, robot_name=None):
         self.actions = None
         self.planner = None
+        self.detector = None
         self.robot_name = robot_name
 
         try: