Fix typo in doctest
Raise a NotImplementedError when fitting composite models.
clarify error message
add changelog entry
use correct PR number
Add test for array coordinate length (issue #1761)
Add len() to coordinates

Closes #1761
Add tests of len() for scalar coordinate and length 1 coordinate
Add changelog entry for 1761
Correct the change log message
Accept empty string/None/False as `sep` for Angle.to_string
Add test for empty string `sep` of Angle
Added `format` examples to coordinates docs
update changelog
Fix problem with names arg colliding with existing names
Update CHANGES.rst
Merge pull request #1989 from eteq/angleemptysepstring

Allow `sep` on `Angle.to_string` to be empty
Merge pull request #1991 from taldcroft/ascii-names

Fix problem with names arg colliding with existing names
Fix conesearch test failure under Python 3.4
Merge pull request #1972 from mdboom/vo/order-independent-comparison

Do dictionary-order-independent comparison in test_printcat