Ignore differences between 32-bit and 64-bit ints
Fix equality for array coordinates

Closes #1832
Added test for #1832 failure mode
Add test for #2037 failure mode
update changelog
Get `Longitude` sign to come out right from `wrap_angle` when 0

Closes #2037
Fix test that incorrectly had '-0h00m00s 0d00m00s' and similar
Ignore long int suffix in doctests, e.g. 1234L
Fix rounding errors with fractional powers.
Simplify use of validate_power in Quantity.__array_prepare__ as
recommended by @mhvk
Add example about fractional powers.
Add CHANGES entry.
Convert floats into Fractions if they are close enough.
Disallow tuples as powers on Quantities
Fix test to test implicit float -> Fraction conversion.
Add more information in the documentation.
Make astropy.io.registry and astropy.io.misc compatible with Python 2 and 3 using six
Avoid double copy of data in registry
Added future imports
Use zip from six to avoid duplicate copy of data in memory