NetworkDataFetcher = function($http) {
  /** @private {!angular.$http} */
  this.http_ = $http;

  /** @private {string} */
  this.template_ = 'https://www.google.com/finance/historical' +
      '?q={q}&authuser=0&output=csv';
}
Fetches stock data by querying the Google Finance API (requires network
connection).
@constructor

@param {!angular.$http} $http