Add option for kmin_factor and kmax_factor to lensing ps buildGrid function.
(#377)
Merge branch '#372' into #377
removed reference to various GSObjects being in base.py which no longer are from GalSim_Quick_Reference.pdf
(#372)
Merge pull request #414 from GalSim-developers/#372

#372 Some file restructuring
Make sure ObjectData starts with all 0's.
(#340)
added to error messages
(#377)
Add clarifying comment about more stringent test of shear variance accuracy
(#377)
Remove debugging print statements.
(#377)
Fix some doc errors in fits.py.  Also add new writeFile function to write an hdu_list.
(#417)
Fix wrong 'if hdu_list' and similar, since fails for hdu_list = HDUList()
(#417)
Add unit tests for new writeFile functionality.  Also tests the empty HDUList() that used to fail.
(#417)
Clarify the compression options available for writeFits
(#417)
Add clarification that kmin_factor, kmax_factor are just convenience parameters.
Check that ngrid, kmin_factor, kmax_factor are integers
Have MakeMaskedImage return smallest sub-image that contains all the non-zero pixels.
Merge pull request #415 from GalSim-developers/#377

#377 Add options to use a larger range of k values when building grid for PowerSpectrum
removed warning re: more than one size param from Airy, since it only has one anyway
documentation typos
Switch from std::isnan to boost::math::isnan #378
merged in master, fixed trivial conflict
(#340)