[wp-gsoc] [Summer of Code] #346: Wrap usernames in HTML5 data attribute and preselect if account exists

[Summer of Code]

#346: Wrap usernames in HTML5 data attribute and preselect if account exists
------------------------------+-------------------------------------
 Reporter:  frederick.ding    |       Type:  enhancement
   Status:  new               |   Priority:  normal
Milestone:  2013 Final (1.0)  |  Component:  Migration & Portability
 Keywords:  needs-ui          |
------------------------------+-------------------------------------
 '''Part 1: include some HTML5 data attributes'''
 When authors are being selected for mapping/creation, we can include some
 data (usernames, etc) as HTML5 data attributes, which can be manipulated
 by other things that hook onto the importer.

 '''Part 2: preselect a user if it exists'''

 When a user already exists with the same username as an author being
 imported, the default behaviour should be to pre-select that user.

 This was previously mentioned in core Trac
 [http://core.trac.wordpress.org/ticket/8455 8455] and
 [http://core.trac.wordpress.org/ticket/16148 16148], but never
 implemented.

--
Ticket URL: <http://gsoc.trac.wordpress.org/ticket/346>
Summer of Code <http://gsoc.trac.wordpress.org>
My example project