*   `LogMessage` now includes a timestamp as beginning of a message.
*   Added MultiBox person detector example standalone binary.
*   Android demo: Makefile build functionality added to build.gradle to fully
    support building TensorFlow demo in Android on Windows.
*   Android demo: read MultiBox priors from txt file rather than protobuf.
*   Added colocation constraints to `StagingArea`.

    environ_cp: copy of the os.environ.

  Returns:
    string of native cuda compute capabilities, separated by comma.
  """
  device_query_bin = os.path.join(
      environ_cp.get('CUDA_TOOLKIT_PATH'), 'extras/demo_suite/deviceQuery')
  if os.path.isfile(device_query_bin) and os.access(device_query_bin, os.X_OK):
    try:
      output = run_shell(device_query_bin).split('\n')
      pattern = re.compile('[0-9]*\\.[0-9]*')