Updated junit-runner to 0.0.41 to be able to use guava version > 15 exclude guava from junit-runner in BUILD.tools explicitly to show where you   need to update the guava version in case you want to use 17 or higher

Testing Done:
I've been using this in our repo to test.

PANTS_DEV=1 ./pants goal test tests/java::

Reviewed at https://rbcommons.com/s/twitter/r/691/