[naoqieus] add led fading method (new version of #812)

[kochigami]

• What is this?
  Naoqi robot can change LED color.

• Requirements
  https://github.com/kochigami/naoqi_driver/tree/kochigami-develop
  https://github.com/kochigami/naoqi_bridge_msgs/tree/kochigami-develop

• Tested with
  Pepper 2.5.5.5, NAO 2.1.4 ROS kinetic

roslaunch jsk_pepper_startup jsk_pepper_startup.launch ...
send *ri* :fade-leds "FaceLeds" 0.5 0.5 0 1 ;; Pepper's eye becomes yellow
send *ri* :reset-leds "FaceLeds" ;; Pepper's eye becomes clear

• Difference between this PR and [naoqieus] add led fading method #812
  this PR uses naoqi_driver service: add fading/ resetting leds services ros-naoqi/naoqi_driver#100 and add fade leds srv ros-naoqi/naoqi_bridge_msgs#41
  812 uses naoqi_bridge service: [naoqi_apps] add node and launch for ALLeds (wip) ros-naoqi/naoqi_bridge#84 and add msg and srv for naoqi_leds ros-naoqi/naoqi_bridge_msgs#33
  Both of them are written by me, and it will take some time to be merged.
  If so, I think gathering basic functions into naoqi_driver (= add fading/ resetting leds services ros-naoqi/naoqi_driver#100) is good.

• TODO

• add explanation about kochigami-develop [jsk_naoqi_robot/README] Add explanation of roseus interface methods #1000

• add explanation about these functions [jsk_naoqi_robot/README] Add explanation of roseus interface methods #1000
  (especially LED group name, link to NAOqi documentation)

[kochigami]

@k-okada
Could you please merge this when you have time?

[kochigami]

@k-okada
Could you please merge this when you have time?
Sorry for my trouble.