code: function getVersionSCXML(machineName, versionKey) {
          let route = getVersionModelRoute(machineName, versionKey);
          return fs.readFileSync(repositoryPath + "/" + route).toString('utf8');
      }
docs: Retrieve the version model.scxml file as a String
  @method getVersionSCXML
  @param {String} machineName The name of the machine
  @param {String} versionKey The key of the version
  @returns {String} The model