python: adapt to new qitype API (event -> signal)
python: adapt to new qitype API (event -> signal)

Change-Id: I0af46711fffc3404e3f396dccb7d32066c5d53f5

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