Add 5.0.4 release notes
Add 5.0.4 release notes

git-svn-id: d9b8539636d91aff9cd33ed5cd52a0cf73394897@533905 13f79535-47bb-0310-9956-ffa450edef68

apache/tapestry-5,apache/tapestry-5,agileowl/tapestry-5,agileowl/tapestry-5,agileowl/tapestry-5,apache/tapestry-5,apache/tapestry-5,apache/tapestry-5