fix tutorial 3 - Githubissues

intermittent:

[michiel@mbp ~/gh/michielbdejong/ilp-node (master *)]$ node scripts/flood.js 1 clp clp
[ '/Users/michiel/.nvm/versions/node/v7.7.1/bin/node',
  '/Users/michiel/gh/michielbdejong/ilp-node/scripts/flood.js',
  '1',
  'clp',
  'clp' ]
flooder open, flooding
tried to find curve peer.testing.ab833ece33938b2327b0d7ab78a28a39c498c9915e8ab05026d5400f0fa2da34.downstream_undefined.hi { 'test.crypto.xrp.':
   { buf: <Buffer 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff ff 00 00 00 00 00 00 ff ff>,
     peer: 'ledger_xrp' },
  'peer.testing.52a46a3834686ed9b9d6bb12d6cad8a3c0cedf92a430e6f2b5d2b8841c615815.upstream_wssamundsenmichielbdejongcom.':
   { buf: <Buffer 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff ff 00 00 00 00 00 00 ff ff>,
     peer: 'upstream_wssamundsenmichielbdejongcom' } }
/Users/michiel/gh/michielbdejong/ilp-node/src/quoter.js:72
    throw new Error('no curve found')
    ^

Error: no curve found
    at Quoter.findCurve (/Users/michiel/gh/michielbdejong/ilp-node/src/quoter.js:72:11)
    at Quoter.findHop (/Users/michiel/gh/michielbdejong/ilp-node/src/quoter.js:105:24)
    at Forwarder.forward (/Users/michiel/gh/michielbdejong/ilp-node/src/forwarder.js:22:54)
    at IlpNode.handleTransfer (/Users/michiel/gh/michielbdejong/ilp-node/src/index.js:227:43)
    at Peer._handleIlp (/Users/michiel/gh/michielbdejong/ilp-node/src/peer.js:27:19)
    at Clp.handleProtocolRequest (/Users/michiel/gh/michielbdejong/ilp-node/src/clp.js:299:49)
    at Clp.incoming (/Users/michiel/gh/michielbdejong/ilp-node/src/clp.js:164:14)
    at emitOne (events.js:96:13)
    at WebSocket.emit (events.js:191:7)
    at Receiver._receiver.onmessage (/Users/michiel/gh/michielbdejong/ilp-node/node_modules/ws/lib/WebSocket.js:143:47)
michielbdejong / ilp-node

fix tutorial 3 #39
