Upgrade to junit-interface 0.11-RC1 in order to fix problems with @RunWith and test timing

We've gotten a lot of fixes for Play into junit-interface recently

In particular, these two bugs would be good to test to see if they're fixed now:

https://github.com/playframework/playframework/issues/2170
https://github.com/playframework/playframework/issues/1667

It would be great to surface any test issues that may be left since we've been making some headway on getting these problems resolved.