EmptyDirContext should support scanning of @Web

git-svn-id: https://svn.apache.org/repos/asf/tomee/tomee/trunk@1612084 13f79535-47bb-0310-9956-ffa450edef68
force resources to be refresh whatever the client sends as header

git-svn-id: https://svn.apache.org/repos/asf/tomee/tomee/trunk@1612087 13f79535-47bb-0310-9956-ffa450edef68
allow to mute force refresh feature

git-svn-id: https://svn.apache.org/repos/asf/tomee/tomee/trunk@1612088 13f79535-47bb-0310-9956-ffa450edef68