code: function writeFile(namespace, fileName, fileLocation) {
    var deferred = q.defer();
    // File is already written by middleware
    deferred.resolve(fileLocation);
    return deferred.promise;
  }
docs: Write file to the storage
  
  @param {string} namespace - location (folder) used to place saved file.
  @param {string} fileName - filename that should be unique within namespace
  @param {string} fileLocation - local filesystem location to the file