code: function restoreEnv(origEnv) {
    var key;
    for (key in origEnv) {
      if (origEnv[key][0]) {
        process.env[key] = origEnv[key][1];
      } else {
        delete process.env[key];
      }
    }
    return;
  }
docs: restore environment to original state
  @arg {Object} origEnv - delta/state of process.env from prior morphing
  @function