code: function commandDescription(desc, state)
  {
    desc = state[desc] || desc;
    return desc.join ? '[' + desc.join(', ') + ']' : desc.toString();
  }
docs: Provides command description, finds matching within state object
  or uses provided one as is
  
  @private
  @param   {string} desc - command's description or property
  to fetch command from current state
  @param   {object} state - current state
  @returns {string} - command's description