added node for IMU to robot model

data/RobotAPI/robots/Armar3/ArmarIII-Head.xml

@@ -166,6 +166,7 @@
         <Child name="Jaw"/>
         <Child name="Kinect"/>
         <Child name="DepthCamera"/>
+        <Child name="HeadIMU"/>
     </RobotNode>
 
     <RobotNode name="Jaw"> 
@@ -252,6 +253,19 @@
             <CoordinateAxis type="Inventor" enable="false" scaling="3"/>
         </Visualization>
     </RobotNode>
+
+    <RobotNode name="HeadIMU">
+        <Transform>
+            <Translation x="0" y="-10" z="0" units='mm'/>
+            <rollpitchyaw roll="90" pitch="0" yaw="0" unitsAngle="degree"/>
+        </Transform>
+        
+        <Visualization enable="true">
+            <CoordinateAxis type="Inventor" enable="false" scaling="3"/>
+        </Visualization>
+    </RobotNode>
+
+
     
     <RobotNode name="Eye_Left_Dummy">
         <Transform>