add fading/ resetting leds services

[kochigami]

• added services for fading/resetting leds
• fading: fadeRGB
• resetting: reset
• This requires add fade leds srv naoqi_bridge_msgs#41.

API ref: http://doc.aldebaran.com/2-5/naoqi/sensors/alleds-api.html#alleds-api
name list ref: "Groups, Short Names and Names" in
http://doc.aldebaran.com/2-5/naoqi/sensors/alleds.html#alleds

old pull-request: ros-naoqi/naoqi_bridge#84

I confirmed this with:

• Pepper (NAOqi 2.5.5.5) + ROS indigo
• Pepper (NAOqi 2.5.5.5) + ROS kinetic
• NAO (NAOqi 2.1.4) + ROS indigo
• NAO (NAOqi 2.1.4) + ROS kinetic

[kochigami]

I confirmed these services worked with four conditions above:
example:

eye color of a robot changes to red:

rosservice call /naoqi_driver/fade_leds "fade_rgb:
  led_name: 'FaceLeds'
  color:
    r: 1.0
    g: 0.0
    b: 0.0
    a: 0.0
  fade_duration:
    secs: 1
    nsecs: 0" 

eye color of a robot changes to default color:

rosservice call /naoqi_driver/reset_leds "data: 'FaceLeds'" 
success: True