Added DragonFly2 configuration files for each robot.

New configuration files has been added for each robot inside the

main/app/robots/<robotName>/conf/camera  or
main/app/robots/<robotName>/camera

Those files contains all the parameters needed by the dragonfly2 module to
correctly initialize the cameras. Previously all those parameters were written
directly on the camera_calib application file (xml).

Now the application has simply to refer to the file with:

icubmoddev --from camera/dragonfly2_config_left.ini
icubmoddev --from camera/dragonfly2_config_right.ini

This allows a more customizable configuration from robot to robot.

IMPORTANT!
Those file needs to be custimized by filling in the GUID parameter of the cameras;
this is needed by the Linux firewire driver in order to correctly differentiate
between the left and the right camera.

See http://wiki.icub.org/iCub_documentation/group__icub__dragonfly2.html for more
info about this issue and how to update the configuration file.