Both preferencefragment and appcompat-v7 submodules need the
android-support-v4.jar to be included in their respective libs/ dirs in
order for ant to build those projects.
Jenkins needs some kind of report from the JUnit tests in order to tell
whether the tests succeeded or not. android-junit-report is a library to do
exactly that. With this setup, Jenkins should now successfully understand the
status of the JUnit tests, where before it just ran them and ignored the
results
