Added test initialization and cleanup in Silverlight to set "en-US" locale on both CurrentCulture and CurrentUICulture.  bugid: 546
Added test initialization and cleanup in Silverlight to set "en-US" locale on both CurrentCulture and CurrentUICulture. 
bugid: 546


JasonBock/csla,BrettJaner/csla,JasonBock/csla,ronnymgm/csla-light,jonnybee/csla,rockfordlhotka/csla,MarimerLLC/csla,jonnybee/csla,BrettJaner/csla,rockfordlhotka/csla,rockfordlhotka/csla,ronnymgm/csla-light,JasonBock/csla,BrettJaner/csla,jonnybee/csla,ronnymgm/csla-light,MarimerLLC/csla,MarimerLLC/csla