Add section on related Astropy packages to the docs
Copy photutils.utils functions
Update imports for new functions
Replace fix_prf_nan with mask_to_mirrored_num
Add tests for mask_to_mirrored_num
Add mask_to_mirrored_num to __all__
Update mask_to_mirrored_sum docs
Add example for mask_to_mirrored_num
Fix failure with Numpy 1.6. Fixes astropy/imageutils#22.
Refactored scale_img
Rename find_imgcuts in tests
Remove tests with min/max cuts
Rename scaling functions in tests
Fix scale_img docstring template
Update __all__
Rename scaling to scale
More docs for scale_img
Fix noise_level default
Rename scale_img module to scale_image
Replace percentile **kwargs