*Possible* fix for #2318.  Not sure if this will fix @cdeil's specific issue, but it *did* fix the issue for me running on my laptop on the institute network.
Allow mask to be set to anything that can be converted to a numpy bool array
Allow flags to be set with array-like in addition to array or FlagCollection
Convert mask and flags input to ndarray
Changelog entry
Use np.intp_t for indices
Adding support for sign (and space) separated sexagesimal coordinates in SkyCoord
Check for and prevent initialization of NDData with Quantity

Closes #2374, though admittedly in an unsatisfactory way.
Add changelog entry
Fix masking in arithmetic

Closes #2403
Update old 'whatsnew' pages to just link to the versions of those pages in the docs for those versions, which will always be properly rendered for their associated Astropy release.  Left the 0.1 one alone, as there was never really a 'whatsnew' page in Astropy 0.1
Add changelog entry
Adding test
Fix some minor formatting issues in the documentation.  In some lines on the
examples the commented lines were not prefixed by >>> where it was in other
cases.  I've make all to be after the >>> so it's formatting properly and not
as an output.
Minor rewrite of space separation support
correct numerous errors in documentation
Include UnitSphericalTransform in represent_as shortcuts
Fix test regression from strict equality to allclose(atol=1e-10)
Add UnitSphericalRepresentation shortcut to PhysicsSphericalRepresentation
Only wrap Longitude angles if some need wrapping