created robot with camera and teleop

new robot in urdf with camera

![image](https://cloud.githubusercontent.com/assets/9864468/5294306/2e7d5e46-7b94-11e4-8653-f9dff1ab6ad7.png)
rviz.launch was changed for fixed frame map

for run:
roslaunch nucobot_gazebo nucobot_world.launch 

for teleoperation control
rosrun nucobot_control key_teleop.py