Added matlab demo file
Update 10.24.2013 1545

spreading_hybrid_gaussian.cc:	In order to resolve #35 the first step required
								that we allow the azimuthal angle contributions to
								go accross the branching points. This updated file
								allows for the crossing of the branch boundaries.
eigenray_test.cc:				Added a test to varify the accuracy of the eigenrays
								produced at the branch points. The branch points, at
								present still produce two eigenrays, but they are the
								exact same values and are what is expected if there
								should only be one returned. Thus the first part of
								#35 is resolved.