Fix equality for array coordinates

Closes #1832
Added test for #1832 failure mode
update changelog
Added examples for formats in time documentation
Added examples to docstrings for TimeFormat subclasses
Made documentation consistent with numpydoc convention
Fit equals signs to full width of table column
Preserve all floating-point precision when writing out a votable.  As
mentioned in #1920.
Add CHANGES entry
Make it easier to write out a VOTable file in binary format from the
abstract table-writing interface.
Add CHANGES entry.
Add more documentation about VOTable serialization formats
Make `python setup.py test --coverage` work with affiliated packages
Documented classes in ascii.core
Fix coding tag.
Raise exception if coverage is used in conjunction with parallel
Add missing public API docstring.
added v0.4 what's new document and updated links
Adjusted for numpydoc convention
Merge pull request #2142 from amras1/document-ascii-classes

Documented classes in io.ascii.core