overriding ContextFinder (to avoid osgi dep) + DatatypConverter to force converter init

git-svn-id: https://svn.apache.org/repos/asf/openejb/trunk@1430014 13f79535-47bb-0310-9956-ffa450edef68
TOMEE-455 using javaee-api 6.0-5-SNAPSHOT + initializing datatypeconverter

git-svn-id: https://svn.apache.org/repos/asf/openejb/trunk@1430015 13f79535-47bb-0310-9956-ffa450edef68