Merged r1491485, r1491841 from tomcat/trunk:
- Change Maven Central repository location to be repo.maven.apache.org
- Update junit to version 4.9
- Download it from Maven Central instead of GitHub

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1491854 13f79535-47bb-0310-9956-ffa450edef68