[promise] swap out promise-js due to https://github.com/elastic/elasticsearch-js/issues/345

src/lib/transport.js

@@ -7,7 +7,7 @@ module.exports = Transport;
 var _ = require('./utils');
 var errors = require('./errors');
 var Host = require('./host');
-var Promise = require('promise-js');
+var Promise = require('promise/lib/es6-extensions');
 var patchSniffOnConnectionFault = require('./transport/sniff_on_connection_fault');
 var findCommonProtocol = require('./transport/find_common_protocol');