[wp-gsoc] [Summer of Code] #343: Move URL helpers to main plugin file

[Summer of Code]

#343: Move URL helpers to main plugin file
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 Reporter:  rmccue            |       Type:  enhancement
   Status:  new               |   Priority:  normal
Milestone:  2013 Final (1.0)  |  Component:  JSON REST API
 Keywords:                    |
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 At the moment, the URL helpers are in `class-wp-json-server.php`. This
 limits us to using them in the server responses, since this file is not
 loaded on non-API pages as per #337.

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Ticket URL: <http://gsoc.trac.wordpress.org/ticket/343>
Summer of Code <http://gsoc.trac.wordpress.org>
My example project