SciPy dependency under try/except block
(#552)
WCS assertion and assertions where they were not earlier added
(#552)
Commented blocks uncommented
(#552)
Trailing whitespaces removed
(#552)
Merge branch '#552' of http://github.com/GalSim-developers/GalSim into #552
Rachel tweaked docstrings
more docstring tweak
(#552)