old_contents: var LimitRequestPromise = require('limit-request-promise');
  var lrp = module.exports = new LimitRequestPromise(1, 0.1);
  lrp.setup([
      {host:'https://chain.localbitcoins.com/', max:1, sec:2},
      {host:'https://test-insight.bitpay.com', max:1, sec:5},
      {host:'https://insight.bitpay.com', max:1, sec:2}
  ]);
  
new_contents: var LimitRequestPromise = require('limit-request-promise');
  var lrp = module.exports = new LimitRequestPromise(1, 0.1);
  lrp.setup([
      // live-net
      {host:'https://search.bitaccess.ca', max:1, sec:2},
      {host:'https://blockexplorer.com', max:1, sec:2},
      {host:'https://chain.localbitcoins.com', max:1, sec:2},
      {host:'https://insight.bitpay.com', max:1, sec:2},
      // test-net
      {host:'https://testnet.blockexplorer.com', max:1, sec:5},
      {host:'https://test-insight.bitpay.com', max:1, sec:5}
  ]);
  
subject: Update system.js