Merge pull request #1887 from mdboom/testing/python3-endianness

Fix for endianness test on Python
Merge pull request #1883 from mdboom/coordinates/speed-up-fk4-fk4-test

Vectorize test_fk4_no_e_fk4
Update CHANGES.rst

Just for consistency with previous releases, I usually make this a "misc" section :)
Merge pull request #1913 from mdboom/coordinates/sexagesimal-exponential

Don't display exponential notation in sexagesimal notation
Merge pull request #1766 from mdboom/vo/table-repr

Improve astropy.io.votable.tree.Table representation
Provide suggestions when an exact unit match can not be found.
Add Returns clause to docstring
Handle unit suggestions by removing accents on Unicode characters,
e.g. ångström -> angstrom.  Fix some other Unicode-related issues.
Remove unused import
Add CHANGES.rst entry
Fix CHANGES.rst