message: Use app name for the exported app json
diff: +import * as _ from 'lodash';
  +
  import { Component, Input, Output, SimpleChanges, OnChanges, OnInit, ViewChild, EventEmitter } from '@angular/core';
  import { TranslateService } from 'ng2-translate/ng2-translate';
  import { IFlogoApplicationModel, IFlogoApplicationFlowModel, Trigger } from '../../../common/application.model';
  @@ -97,8 +99,9 @@ export class FlogoApplicationComponent implements OnChanges, OnInit {
  appExporter() {
  return () => this.appDetailService.toEngineSpec()
  .then(engineApp => {
  + const appName = _.snakeCase(engineApp.name);
  return [{
  - fileName: 'app.json',
  + fileName: `${appName}.json`,
  data: engineApp
  }];
  });
  