Added attribute escaping to tag building.

git-svn-id: https://plugins.svn.wordpress.org/quickstart/trunk@1026083 b8457f37-d9ea-0310-8a92-e5e31aec5664
Lets just slip this fix into the latest release.

git-svn-id: https://plugins.svn.wordpress.org/quickstart/trunk@1026084 b8457f37-d9ea-0310-8a92-e5e31aec5664