JDOM2 maven pom requires old version of jaxen, should be 1.1.6

[rolfl]

Current maven pom is:

    <dependency>
        <groupId>jaxen</groupId>
        <artifactId>jaxen</artifactId>
        <version>1.1.4</version>
        <optional>true</optional>
    </dependency>

Even though the code is built and compiled against 1.1.6

Similarly, Xerces is listed as 2.10, but should be 2.11

Update maven pom to later versions.