Rename SpectralCubeMask -> BooleanArrayMask
Accept boolean arrays in with_mask

Closes #51
Merge pull request #73 from ChrisBeaumont/mask-refactor

Mask Refactorings
Better error message when units aren't right for closest spectral channel.
Add a code snippet to doc homepage

Closes #62
Merge pull request #76 from ChrisBeaumont/getting-started

Documentation front page improvements
Merge pull request #34 from astrofrog/better-error-spectral-channel

closest_spectral_channel error message can be confusing
Use a Quantity-safe assert_allclose
Changed radio-tools to radio-astro-tools
Don't import version from package to avoid importing all the dependencies (causes issues for egg_info)
WIP: add conversion between *LINEAR* spectral coordinate systems.  Leaves
MAJOR todo items open.  Not fully implemented due to bug in wcslib or
astropy.wcs
plane/airport work on spectral axis conversion.  Definitely a continued
WIP.
some renaming and refactor toward usefulness
another intermediate commit
Fix test answer error
Merge pull request #3 from ChrisBeaumont/fix-assert-allclose

Fix test answer error
Merge pull request #80 from astrofrog/fix-assert-allclose

Use a Quantity-safe assert_allclose
Reorganize big_data.rst to be a guide for working
effectively with large cubes.
Implement slice-wise aggregation for some numpy methods.

Fill in missing docstrings
Refactor getter to property