Adding credits and notes.

git-svn-id: https://plugins.svn.wordpress.org/gravity-forms-placeholder-support-add-on/trunk@901986 b8457f37-d9ea-0310-8a92-e5e31aec5664
Making small changes

git-svn-id: https://plugins.svn.wordpress.org/gravity-forms-placeholder-support-add-on/trunk@901987 b8457f37-d9ea-0310-8a92-e5e31aec5664