Update imageutils
Added matplotlib for test suite
Skip doctests in extern.imageutils
Skip normalize tests if matplotlib is not installed
Merge pull request #181 from larrybradley/imageutils

Update imageutils in extern
Add wcs option for segment properties
Add tests for segmentation wcs
Minor segmentation doc changes
Doc update
Include icrs in (ra/dec)_centroid name
Include local copy of pixel_to_skycoord
wcs.has_distortion workaround
Enable deprecations as exceptions
Fix deprecations
Merge pull request #184 from astrofrog/enable-deprecations-as-exceptions

Enable deprecations as exceptions
Prepare data only once in segment_properties
Handle negative moments/variance
Add test for negative moments/variance
Make detection threshold strictly greater than
Updated package template to v0.4.1 (includes update of astropy-helpers to v0.4.3)