fix galsim "unit test" and add some cases (#488)
fix galsim "unit test" and add some cases (#488)

sadly this unit test was implemented in a completely broken way so it wasn't really checking
parameter values. this fixes that. i've also added a few additional cases and commented out the two
that are currently broken due to issue #482.
jeff-regier/Celeste.jl,jeff-regier/Celeste.jl,jeff-regier/Celeste.jl