Switch from using the mime4j charset list to the Java 1.5 java.nio.charset Charset class.
Switch from using the mime4j charset list to the Java 1.5 java.nio.charset Charset class.

Based on this comment in MIME4J, this seems like a win:


 * Utility class for working with character sets. It is somewhat similar to
 * the Java 1.4 <code>java.nio.charset.Charset</code> class but knows many
 * more aliases and is compatible with Java 1.3. It will use a simple detection
 * mechanism to detect what character sets the current VM supports. This will
 * be a sub-set of the character sets listed in the
 * <a href="http://java.sun.com/j2se/1.5.0/docs/guide/intl/encoding.doc.html">
 * Java 1.5 (J2SE5.0) Supported Encodings</a> document.
 * <p>
 * The <a href="http://www.iana.org/assignments/character-sets">
 * IANA Character Sets</a> document has been used to determine the preferred
 * MIME character set names and to get a list of known aliases.
 * <p>




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