message: Make Bazel more verbose in CI builds.
  Travis has complained about extended periods of no output, especially on
  the coverage build. This should make Bazel print something after every
  step finishes which will mitigate this issue or help debug if there is a
  real build stall.
diff: @@ -64,7 +64,7 @@ BAZEL_OPTIONS="--package_path %workspace%:/source"
  export BAZEL_QUERY_OPTIONS="${BAZEL_OPTIONS}"
  export BAZEL_BUILD_OPTIONS="--strategy=Genrule=standalone --spawn_strategy=standalone \
  --verbose_failures ${BAZEL_OPTIONS} --action_env=HOME --action_env=PYTHONUSERBASE \
  - --jobs=${NUM_CPUS}"
  + --jobs=${NUM_CPUS} --show_task_finish"
  export BAZEL_TEST_OPTIONS="${BAZEL_BUILD_OPTIONS} --test_env=HOME --test_env=PYTHONUSERBASE \
  --cache_test_results=no --test_output=all"
  [[ "${BAZEL_EXPUNGE}" == "1" ]] && "${BAZEL}" clean --expunge
  