Add LocaleInfo.hasAnyRTL() which returns true if the application was
built with support for any RTL locales.  This will be used in improving
Bidi support in GWT widgets.

Public review at: http://gwt-code-reviews.appspot.com/378801/show

Patch by: jat
Review by: rice, tomerigo (TBR)


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@7966 8db76d5a-ed1c-0410-87a9-c151d255dfc7