Fix bug with loading the genesis block for testnet.

lib/node.js

@@ -209,7 +209,7 @@ Node.prototype._loadConsensus = function(config) {
   var genesisBlock;
   if (config.genesis) {
     genesisBlock = config.genesis;
-  } else if (config.testnet) {
+  } else if (config.network === 'testnet') {
     genesisBlock = genesis.testnet;
   } else {
     genesisBlock = genesis.livenet;

test/node.unit.js

@@ -309,7 +309,7 @@ describe('Bitcoind Node', function() {
     });
     it('should use the testnet genesis if testnet is specified', function() {
       var config = {
-        testnet: true
+        network: 'testnet'
       };
       node._loadConsensus(config);
       should.exist(node.chain);