Updated F17 per LC-2904

https://www.w3.org/2006/02/lc-comments-tracker/35422/WD-WCAG20-TECHS-20140107/2904
Updated per LC-2944
Changes to ARIA19 UA notes

Per
https://www.w3.org/2006/02/lc-comments-tracker/35422/NOTE-WCAG20-TECHS-20140306/2912
ARIA1 Typos and Indentation Fix
One more typo fix /text\/xhtml/text\/html/
Merge pull request #32 from takenspc/aria1_typofix

ARIA1 Fix typos and indentation issues
Merge commit '83a3e7011b5d0dd0e3d7482c878c3ba2d822978f' into Working-Branch-for-Fall-2014
modified G200 to apply to GL 3.2 per LC-2946
modified G201 to apply to GL 3.2 per LC-2946
Modified F37 per LC-2946

"status" changed to "selection" 3x
Modified Understanding 3.3.2 per LC-2946
Duplicated pull req #25 that was merged with master

...by accident.
Editorial change to C7 per comment

http://lists.w3.org/Archives/Public/public-comments-wcag20/2014Aug/0016.html
Change in G131 per LC-2948

https://www.w3.org/2006/02/lc-comments-tracker/35422/WD-WCAG20-TECHS-20140724/2948
changes to G128 per LC-2947

https://www.w3.org/2006/02/lc-comments-tracker/35422/WD-WCAG20-TECHS-20140724/2947
Changes to Understand 1.4.3 per LC-2949

https://www.w3.org/2006/02/lc-comments-tracker/35422/WD-UNDERSTANDING-WCAG20-20140724/2949
Change to 1.4.6 because identical to 1.4.3 per LC-2949
Needed a gitignore
Change to H2 per WG call on Sept 2
Staging review draft prior to Note pub