code: function parseOptions(options) {
    let opts = {};
  
    _.each(nodecipher.defaults, (defaultVal, name) => {
      if (!_.isUndefined(options[name])) {
        opts[name] = options[name];
      }
    });
  
    return opts;
  }
docs: Parses the command line options into a more consise Object that will be
  accepted by NodeCipher.
  
  @param {Object} options
  @returns {Object} opts