Update email headers to use array formatting instead of a string

git-svn-id: https://plugins.svn.wordpress.org/visual-form-builder/trunk@891942 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update admin with more jQuery UI CSS overrides for the disabled classes

git-svn-id: https://plugins.svn.wordpress.org/visual-form-builder/trunk@891943 b8457f37-d9ea-0310-8a92-e5e31aec5664