The protobuf jars are now available from Maven Central. Use them instead
of building our own.

- the name includes a version
- the top-level directory of the tar has the same name as the archive

Failure should generally result in output unless something goes wrong,
but timeout currently doesn't, but should be printed 100% of the time.

They were two halves of the same whole.

The removal of grpc.framework.assembly.implementations_test should have
happened along with the removal of the test itself in 31e65bea.

This completes issue #726. All that cascading activation stuff just
didn't work out as cleanly as I had hoped it would.

Added prettier cloud to prod output and a history of results

temp remove timing out test to investigate

Allows:
- running python tests in parallel
- clearer Travis output
- subjects each python test to the five minute run_tests timeout,
  instead of ALL the tests to the five minute timeout
- easier benchmarking of which tests are slow

Without the correct line endings docker had errors interpreting '&&' as a command.