Beamline magnet placement and geometry (#27)

Tom Polakovic requested to merge Polakovic/NPDet:magnets into master

I finished working on geometry of the Roman pots, so now I have some time to work on related elements.

@whit, from what I can tell, there are three types of magnets: octupoles, quadrupoles and the spectrometer magnet. I know the dimensions of the quadrupole and spectrometer magnet, but I'm missing info on the octupole. Do you have any fresher materials than the March IR Design status presentation?

Edited by Whitney Armstrong

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