Fix mask interpolation
Update mask docs
Update phot_table docs
Remove line break in example
Merge pull request #133 from larrybradley/mask_interp

Fix mask interpolation
Fix typo
Merge pull request #134 from larrybradley/mask_docs

Update mask docs
Merge pull request #136 from larrybradley/aperture_docs

Update returned phot_table docs
Update to astropy-helpers v0.4.1
Rename model eval to evaluate based on astropy model refactoring
Need to keep eval with astropy 0.4
Fix typo