add doc files to .gitignore
add doc files to .gitignore

Change-Id: I1f52fe889fa0b0c20d775a771ccbdd991ea2a73b
Reviewed-on: http://gerrit.aldebaran.lan:8080/17520
Reviewed-by: cgestes <ddb78fe00abb42f91254c16a0860e38eb0781789@aldebaran-robotics.com>
Tested-by: llec <42f1a1c02cacc0f5b0188f0127ea77bedfdcf21a@aldebaran-robotics.com>

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