[JXR-112]
 - Upgrade plexus-utils from 3.0.18 to 3.0.20


git-svn-id: https://svn.apache.org/repos/asf/maven/jxr/trunk@1634324 13f79535-47bb-0310-9956-ffa450edef68
[JXR-116]
 - Upgrade doxia from 1.2 to 1.4


git-svn-id: https://svn.apache.org/repos/asf/maven/jxr/trunk@1634325 13f79535-47bb-0310-9956-ffa450edef68