document v0.4.2 changes
document v0.4.2 changes

Conflicts:
	CHANGES.rst

kbarbary/sncosmo,kbarbary/sncosmo,sncosmo/sncosmo,kbarbary/sncosmo,sncosmo/sncosmo,dannygoldstein/sncosmo,dannygoldstein/sncosmo,dannygoldstein/sncosmo,sncosmo/sncosmo