Add basic functionality to run nosetests in parallel -- getting errors though.
(#342)
Add missing import
Merge branch '#352' into #342

Conflicts:
	include/galsim/SBBoxImpl.h
	src/SBInterpolatedImage.cpp
	tests/test_correlatednoise.py
Only get the nosetests version if it is not None
(#342)
Merged #352 into this branch to test correlatednoise test thread safety
(#342)
Workaround for bug in python 2.6 multiprocessing
(#342)
Merge branch '#350' into #342
Merge branch '#352' into #342

Conflicts:
	CHANGELOG.md
	galsim/base.py
	src/SBMoffat.cpp
Fix bug from merge
(#342)
Merge branch 'master' into #342
Merge branch 'master' into #342
Resolved #352-related conflicts merging in master
(#342)
initial setup of HSMParams struct in .h file
(#365)
working HSMParams at C++ level only, no wrapping yet
(#365)
wrapped HSMParams, but currently without proper docstrings in pysrc
(#365)
added basic hsmparams functionality in psfcorr.py
(#365)
added part of pysrc that I missed originally
(#365)
dereferencing null pointers is a bad idea
(#365)
pass through hsmparams appropriately
(#365)
added pysrc docstring for HSMParams
(#365)