Added 'locale' to Text, Keyboard, and Composition Events [ISSUE-119]

Hi, folks-

In the latest draft of DOM3 Events [1], I have added a 'locale' 
attribute to the KeyboardEvent, CompositionEvent, and TextEvent 
interfaces, as agreed in telcons and at TPAC.

I took the liberty of renaming 'inputLocale' to 'locale', since most 
developers prefer shorter, nonCamelCased names, and it seems equally 
descriptive.

Please let us know if this satisfies your issue.

[1] http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html

Regards-
-Doug Schepers
W3C Team Contact, SVG, WebApps, and Web Events WGs