Merge pull request #7 from beckermr/master

fixed error message bug
Merge pull request #8 from beckermr/master

code to support iterative fitting for seeding of coadd fits
Merge pull request #9 from beckermr/master

fixed a few bugs in nbrs modeling
Merge pull request #10 from beckermr/master

changes to guesser to allow for bright things
possible fix for mask_frac.  Simplify sums
Merge branch 'master' of github.com:esheldon/gmix_meds
cosmetic
Merge remote-tracking branch 'upstream/master'