Automattic/Co-Authors-Plus — pull request #139 by johnciacia (2013-09-19 05:43:24+00:00)
Title: Remove extraneous space between last two items.

There is an extra space between the last two items, so the output of `coauthors()` would generate the output `John Smith, John Doe and Jane Doe`. It was really noticeable when I tried adding a serial comma with `coauthors( null, ', and '. The output was `John Smith, John Doe , and Jane Doe` (notice the extra space between John Doe and the comma).