version 5.5: added site tracking feature (optional setting)

git-svn-id: https://plugins.svn.wordpress.org/activecampaign-subscription-forms/trunk@896440 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated description - it was getting cut off

git-svn-id: https://plugins.svn.wordpress.org/activecampaign-subscription-forms/trunk@896441 b8457f37-d9ea-0310-8a92-e5e31aec5664