Show information of registered models. All registered models are stored in .registeredModels If params.displayEverything is true, module will show additional info
function (params) {
    var res = [];
    if (typeof (params) === 'undefined') params = { displayEverything: false };
    if (!this.registeredModels || Object.keys(this.registeredModels).length === 0) {
      res.push('There is no registered models');
    } else {
      res.push('List of registered models');
      for (var modelName in this.registeredModels) {
        res.push('  - ' + modelName);
        if (params.displayEverything) {
          for (var key in this.registeredModels[modelName]) {
            res.push('      ' + key + ' : ' + this.registeredModels[modelName][key].type);
          }
        }
      }
    }

    return res.join('\n');
  }