Removed parentheses around ImportErrors so they will be skipped by coverage
Added centroid tests
Added utils/scale_img tests
Fixes to scale_img
Fixed detect_sources when filter_fwhm not input; check npixels input
Added core detection tests
Removed unused method in findstars.py
Cleanup unused items in test_findstars
Added tests for scale_img
Minor fix in scale_asinh
removed __future__ imports from tests/__init__.py
Use relative imports in test_morphology
pep8 fixes in tests
Skip scale_img tests if skimage is unavailable
Use astropy pytest in test_scale_img
Merge pull request #66 from larrybradley/detection-tests

Added detection, morphology, and scale_img tests
Use relative imports for consistency; pep8
Fixed line wrap in findstars.py
pep8 arrayutils.py
Fixed prf_nan comparison to True