Added support for an optional user email field on the form.  When enabled, the email is required and must be valid.
Added support for an optional user email field on the form.  When enabled, the email is required and must be valid.

git-svn-id: fdf99c15a7044ccc47fd64468c5536dcbc826213@634374 b8457f37-d9ea-0310-8a92-e5e31aec5664

mpwalsh8/wpgform,mpwalsh8/wpgform