Added helper methods for standard date formats and applied them

Fixes #1119
Fixed layout of package stats sidebar with intl date.

Fixes #1118
Fixed FxCop errors
Restored en-US long date format
Merge pull request #1124 from NuGet/kinhln-crossdomain

Add clientaccesspolicy.xml file to allow Silverlight to access api services.
Merge branch 'anurse-1118-1119-datefixes' into qa
Fixed unobtrusive validation in Dynamic Data admin section
Merge pull request #1127 from NuGet/anurse-1126-ysoddynamicdata

Fix #1126 - YSOD in Dynamic Data
Merge pull request #1123 from NuGet/anurse-1118-1119-datefixes

Anurse 1118 1119 datefixes