Fix GERONIMO-6165. This commit introduce the dependency on and the usage of (shaded and relocated) apache mime4j core library. mime4j replaces util/QuotedPrintable* classes which will be deleted by this commit.

git-svn-id: https://svn.apache.org/repos/asf/geronimo/specs/trunk@1641681 13f79535-47bb-0310-9956-ffa450edef68