Bug fixes scripts npm

contracts/Migrations.sol

@@ -0,0 +1,23 @@
+pragma solidity ^0.4.17;
+
+contract Migrations {
+  address public owner;
+  uint public last_completed_migration;
+
+  modifier restricted() {
+    if (msg.sender == owner) _;
+  }
+
+  function Migrations() public {
+    owner = msg.sender;
+  }
+
+  function setCompleted(uint completed) public restricted {
+    last_completed_migration = completed;
+  }
+
+  function upgrade(address new_address) public restricted {
+    Migrations upgraded = Migrations(new_address);
+    upgraded.setCompleted(last_completed_migration);
+  }
+}

migrations/1_initial_migration.js

@@ -1,5 +1,7 @@
+var Migrations = artifacts.require("./Migrations.sol");
 var HelloEthSalon = artifacts.require('./HelloEthSalon.sol');
 
 module.exports = function(deployer) {
+  deployer.deploy(Migrations);
   deployer.deploy(HelloEthSalon);
 };