Update usu_quad_prob01.pddl

1) Changed (path MiddleOfQuad AnimalSciences East) to (path MiddleOfQuad AgriculturalSciences East)
2) Changed (path AnimalSciences MiddleOfQuad West) to (path AgriculturalSciences MiddleOfQuad West)

See http://www.vkedco.blogspot.com/2014/11/automatic-extraction-of-geo-spatial.html for details.