[WHISKER-12] Cleanup Build Infrastructure
- Use a more sensible version of Maven: 2.2.1, which is the same as in Rat. We currently do not need any Maven 3 features in our Maven Plugin.

git-svn-id: https://svn.apache.org/repos/asf/creadur/whisker/trunk@1623076 13f79535-47bb-0310-9956-ffa450edef68