Speed up fk4_no_e_fk4 test.
Mention acceptable shortcut for `list(six.iterkeys(d))`
Fix Python 3 issue on big endian platforms
Add CHANGES entry
Fix definition of "bar"
Merge pull request #1910 from mdboom/unit/bar

Definition of units.bar is off by a factor of 1000
Merge pull request #1891 from mdboom/docs/six-guidelines

Additional note to six coding guidelines
Alternative fix for #1908.  Don't display scientific notation in sexagesimal.
Update CHANGES.rst
Fix #1766: Use Table's repr for io.votable.tree.Table
Add a CHANGES entry
It doesn't make to test this for Unicode guidelines.
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
Fix typo
Update CHANGES.rst

Just for consistency with previous releases, I usually make this a "misc" section :)
Fix issue where supplying None for header_start causes read failure
Add test of reading with header_start=None for NoHeader
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