Check if Pitch Control implements Boeing example

[This file](https://github.com/forsyde/forsyde-shallow-examples/blob/master/src/ForSyDe/Shallow/Example/Synchronous/PitchControl/PitchControlSS.hs) needs to be compliant with the [Boeing pitch control example](http://ctms.engin.umich.edu/CTMS/index.php?example=AircraftPitch&section=SystemModeling).