fixed some warnings

git-svn-id: https://plugins.svn.wordpress.org/webmention/trunk@857842 b8457f37-d9ea-0310-8a92-e5e31aec5664
fixed pseudo hook

git-svn-id: https://plugins.svn.wordpress.org/webmention/trunk@857953 b8457f37-d9ea-0310-8a92-e5e31aec5664
v2.2.0

git-svn-id: https://plugins.svn.wordpress.org/webmention/trunk@859457 b8457f37-d9ea-0310-8a92-e5e31aec5664