Initial commit of nao_interaction functionalities

Contains:
- The ```nao_interaction``` metapackage
- The ```nao_interaction_msgs``` package, which contains all the msgs, srvs, actions for the ```nao_interaction``` proper functionality
- The ```nao_interaction_launchers``` package
- The ```nao_vision``` package which implements in ROS the following functionalities of NAOqi:
 - Face detection
 - Motion detection
 - Landmark detection
- The ```nao_audio``` package which implements in ROS the following functionalities of NAOqi:
 - Configuration of the master volume
 - Recording an audio file in NAO 
 - Playback an audio file from NAO
 - Audio source localization