FIX. wordpress 4.0 compatibility

git-svn-id: https://plugins.svn.wordpress.org/envialosimple-email-marketing-y-newsletters-gratis/trunk@981695 b8457f37-d9ea-0310-8a92-e5e31aec5664
FIX. wordpress 4.0 compatibility

git-svn-id: https://plugins.svn.wordpress.org/envialosimple-email-marketing-y-newsletters-gratis/trunk@981698 b8457f37-d9ea-0310-8a92-e5e31aec5664
FIX. wordpress 4.0 compatibility

git-svn-id: https://plugins.svn.wordpress.org/envialosimple-email-marketing-y-newsletters-gratis/trunk@981702 b8457f37-d9ea-0310-8a92-e5e31aec5664