define default account for each contract

lib/contracts/code_templates/define-web3-simple.js.ejs

@@ -1,3 +1,9 @@
 __mainContext.web3 = undefined;
 web3 = new Web3(new Web3.providers.HttpProvider("<%- url -%>"));
-<%- done  %>
+web3.eth.getAccounts(function(err, accounts) {
+  if (err) {
+    return done(new Error(err));
+  }
+  web3.defaultAccount = accounts[0];
+  <%- done  %>
+});

lib/contracts/code_templates/vanilla-contract.js.ejs

@@ -2,3 +2,4 @@
 <%- className %> = new web3.eth.Contract(<%- className %>Abi);
 <%- className %>.options.address = '<%- contract.deployedAddress %>';
 <%- className %>.address = '<%- contract.deployedAddress %>';
+<%- className %>.options.from = web3.eth.defaultAccount;

lib/core/engine.js

@@ -110,6 +110,7 @@ class Engine {
 
   codeGeneratorService(_options) {
     let self = this;
+
     let generateCode = function (contractsManager) {
       let codeGenerator = new CodeGenerator({
         blockchainConfig: self.config.blockchainConfig,