Remove less accurate/computationally stable angular distances
Rename vincenty... to angular_separation, update documentation
Expand spherical distance tests to include float, quantity, angle
Correction to separation docstring that caused sphinx build failurs
Remove reference to non-public routines in documentation.
Retry separation docstring, as it still gives errors
Merge pull request #1397 from mhvk/coordinates-remove-dist-approximations

Remove less accurate/computationally stable angular distances