Update imagestats sigmaclip_stats
Replace broadcast_arrays
Do not apply mask to Background outputs
change background names from mesh to lores
Add interp_order keyword to Background
Add reference to Stetson PASP paper
Update .travis.yml
find_peaks threshold must be scalar (scikit-image) [skip ci]
Do not subtract background within SegmentProperties
Exclude extern folder from coverage report
Merge pull request #199 from cdeil/coverage-no-extern

Exclude extern folder from coverage report
Zero negative pixels prior to calculating moments
Temp workaround for invalid certificate issue on travis-ci
Merge pull request #202 from cdeil/issue-202

Travis-CI failure due to invalid certificate?
Fix exact elliptical overlap issue
Fix a second bug in the elliptical overlap calculation
Merge pull request #198 from cdeil/issue-198

Bug in exact elliptical photometry