[model_io] Load sensors information from URDF about idyntree HOT 7 CLOSED

cc @naveenoid

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A useful note for modeling of 6 Axis F/T sensors, Gyroscope and Accelerometers is available in : http://wiki.codyco.eu.dev/doku.php?id=outline_of_state_derivatives_of_rigid_body_dynamics#measurement_equations_and_their_derivatives .

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Regarding the loading of sensors informations from URDF, I recently exposed (in 9f221c7) the function for creating a SensorsList from a URDF (for now supporting only F/T sensors expressed with the gazebo extensions to URDF) from the bindings, for use in preliminary BERDY integration.

The function added is available in https://github.com/robotology/idyntree/blob/master/model_io/urdf/include/iDynTree/ModelIO/URDFSensorsImport.h and an example on how to use it is available in https://github.com/robotology/idyntree/tree/master/examples/matlab/SensorsListParsing .

@claudia-lat We can use this tutorial as a starting point (when the spatialV2 forward kinematics is ready) to compute the transform between the spatialV2 frames and the sensor frames.

@naveenoid It would be nice to extend the tutorial to other sensors as soon as we implement them.

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Great work. Let's see how this proceeds and let's keep in touch with the community ;)

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Update : 815fce9 presents first successful tests. Run the test on UnitTestURDFGenericSensorImport to see how sensors can be added a read from URDF.

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cc @fjandrad

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I think this was solved a long time ago, feel free to open a new issue if this is not the case.

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