A few short docstrings in examples for issue #1414

In the spirit of encouraging docstrings in tests...
Add link to flymake-cursor.el in Emacs dev docs
Update matchsep.rst

This PR adds the missing distance parameters in a coordinate matching example.
Removed an unused import and corrected a typo
Add mention of coordinates in the What's New overview
Fix bug setting a masked Table row value
Minor re-wording/linking of overview about coordinates
Merge pull request #10 from eteq/whatsnew-coordinates-overview

Minor re-wording/linking of overview about coordinates
Merge pull request #2745 from taldcroft/coordinates-whatsnew-overview

Add mention of coordinates in the What's New overview
Update astropy_helpers to v0.4
Merge pull request #2744 from mafagafo/master

Removed an unused import and corrected a typo
Update CHANGES.rst for 2734
Merge pull request #2734 from taldcroft/table-masked-row-assign-2734

Fix bug setting a masked Table row value
Merge pull request #2747 from embray/ah-update

Update astropy_helpers to v0.4
Added a known issue about locale error on MacOS X
Changed code-style astropy to Astropy in header of docs
Fix mistake in what's new 0.4 - the integrated client does not start up a hub, it actually starts up a hub proxy
Add a section on HTML read/write to What's New
Add a 'Full change log' section at the end of What's New
Make section underline match text length