FEATURE: Customer Name for MailingList Snap-in

Added optional First and Last name fields on the Mailing List Snap-in. They are hidden by default with display:none but can be shown via CSS or javascript such as:

<script language="javascript">

$('#dvMailingListName').attr('style', 'display:block');

$('#spMailingListEmailLabel').attr('style', 'display:inline');

</script>