JavaScript: implement asynchronous service retrieval
JavaScript: implement asynchronous service retrieval

Change-Id: Ie45cbf398110359837f5d5ad3794ebb37f8d0b4b
Reviewed-on: http://gerrit.aldebaran.lan:8080/18183
Reviewed-by: llec <42f1a1c02cacc0f5b0188f0127ea77bedfdcf21a@aldebaran-robotics.com>
Tested-by: llec <42f1a1c02cacc0f5b0188f0127ea77bedfdcf21a@aldebaran-robotics.com>

aldebaran/libqi,aldebaran/libqi-java,aldebaran/libqi-java,bsautron/libqi,vbarbaresi/libqi,aldebaran/libqi-java,aldebaran/libqi,aldebaran/libqi