move Contract object to blockchain module

lib/contracts/blockchain.js

@@ -90,6 +90,10 @@ class Blockchain {
     this.web3.eth.getBlock(blockNumber, cb);
   }
 
+  ContractObject(params) {
+    return new this.web3.eth.Contract(params.abi);
+  }
+
 }
 
 module.exports = Blockchain;

lib/contracts/deploy.js

@@ -308,7 +308,7 @@ class Deploy {
         });
       },
       function createDeployObject(next) {
-        let contractObject = new self.web3.eth.Contract(contract.abiDefinition);
+        let contractObject = self.blockchain.ContractObject({abi: contract.abiDefinition});
 
         try {
           const dataCode = contractCode.startsWith('0x') ? contractCode : "0x" + contractCode;