main author:  John F. Gibson <gibson@cns.physics.gatech.edu>	
contributors: Jonathon Halcrow <jhalcrow@cns.physics.gatech.edu>	
	      Tobias Kreilos   <tobias.kreilos@epfl.ch>
	      Milos Ilak <milosilak@gmail.com>
	      Evan Brand <evan.w.brand@gmail.com>