Adding SkyRectangularAperture and SkyRectangularAnnulus classes
Adding test for SkyRectangular classes
Fixed #208
Merge pull request #211 from adonath/fix_for_#208

Fixed #208
Fix typo [skip ci]
Add jinja2 to astropy dev build in .travis.yml
PEP8 fixes in psf.py
PEP8 fixes [skip ci]
PEP8 fix [skip ci]
PEP8 fixes [skip ci]
PEP8 fixes in circular_overlap
PEP8 fixes in elliptical_overlap
PEP8 fixes in rectangular_overlap
PEP8 fixes in utils
PEP8 fixes in tests
PEP8 fixes in aperture_funcs
Update extern.stats to match astropy merged version
Update docs with new Gaussian FWHM <-> sigma constant
Merge pull request #204 from bsipocz/aper_adding_skyrectangulars

Adding SkyRectangularAperture and SkyRectangularAnnulus classes to aperture photometry
Simplify region selection