Allow time format and scale strings to be case-insensitive
explicitly stated that we follow the PSF code of conduct
reverse order of operands
improve logic
correct inverse and start a new Travis build.
Restore compatibility with Python 3.2
Remove less accurate/computationally stable angular distances
Rename vincenty... to angular_separation, update documentation
Expand spherical distance tests to include float, quantity, angle
Refactor wcs to use six
Disable range check for degrees_to_dms and hours_to_hms
First attempt at IERS A, B table classes, interpolation of UT1-UTC.
Cleanup of logical vs integer, use of super.

Correct bug introduced with previous commit
Memoize IERS_A and IERS_B: tables can be kept for session.
Initial linkage to time, with only simple exception messages.

Correction to linkage to Time
First test cases -- if for nothing else than stop me from some silly mistakes
Cleanup of interfaces

Cleanup of interfaces
Moved IERS-B data and both readme's to data subdirectory
Adapt setup_package.py to include iers/data files
Add documentation, some tests, ensure ReadMe's work on .gz files