Move interpolation_masked_data to utils.interpolation
Add mask_to_mirrored_num
Remove mask_to_mirrored_num from photutils.extern
Update psf photometry to utils.mask_to_mirrored_num
Fix example in mask_to_mirrored_num
Added tests and minor changes to psf.py
Merge pull request #214 from larrybradley/interpolation

Add mask_to_mirrored_num
Merge pull request #216 from adonath/psf_photometry_tests

Added tests and minor changes to psf.py
Fix SkyEllipticalAperture's theta
Adding more tests for the SkyAperture classes
Removing TODO comments
Adding hdu return option to make_4gaussinas_image
adding hdu/wcs/wcsheader options to make_gaussian_sources
Updating tests to use generated rather than remote data
Updating test
Adding docs note about using the central pixel scale
Fixing docstring of SkyCircularAnnulus
scale and angle in to_pixel() method of SkyApertures are fixed to be the center of the image
Adding full remote test to compare results with catalogue values
Adding frame to central_pos get the valid pixel scale