added info on petition forms

git-svn-id: https://plugins.svn.wordpress.org/affiliates-contact-form-7/trunk@1051071 b8457f37-d9ea-0310-8a92-e5e31aec5664
tagged 3.2.0

git-svn-id: https://plugins.svn.wordpress.org/affiliates-contact-form-7/trunk@1051073 b8457f37-d9ea-0310-8a92-e5e31aec5664