[dpub-aria] 4 skeleton sections added

Hi all,
I just pushed 4 skeleton role defs to aria/dpub.html in master. In hopes 
that they will be good to serve for the initial exercise of the 
approach, I chose the four terms relating to glossaries (this gives us a 
xhv vocab dupe, parent/child relationships, region and atomic types, and 
a link type). Shane, I looked in the wiki for parent roles, but didnt 
see any (or did I look at the wrong page? [1]); made up three of my own 
in the meanwhile. And, needless to say, many placeholders left to fill in.

For now, /markus

[1] https://www.w3.org/dpub/IG/wiki/DPUBVocabulary

> Shane McCarron <mailto:shane@aptest.com>
> 22 Jan 2015 23:06
> Notice indicates that it cannot be skipped.  It mentions a few example 
> situations.  Is this equivalent to a "modal" region?  Take a look at 
> the aria-modal description [1].  Basically I am trying to identify a 
> synonym that has the appropriate extant properties to ease 
> implementation for AT vendors.
>
> [1] http://w3c.github.io/aria/aria/aria.html#aria-modal
>
> -- 
> Shane McCarron
> Managing Director, Applied Testing and Technology, Inc.