adapt contracts for upgradeability

contracts/token/ERC20/DetailedERC20.sol

@@ -1,14 +1,14 @@
 pragma solidity ^0.4.21;
 
 import "./ERC20.sol";
+import 'zos-lib/contracts/migrations/Migratable.sol';
 
-
-contract DetailedERC20 is ERC20 {
+contract DetailedERC20 is Migratable, ERC20 {
   string public name;
   string public symbol;
   uint8 public decimals;
 
-  function DetailedERC20(string _name, string _symbol, uint8 _decimals) public {
+  function initialize(address _sender, string _name, string _symbol, uint8 _decimals) public isInitializer("DetailedERC20", "0") {
     name = _name;
     symbol = _symbol;
     decimals = _decimals;

contracts/token/ERC20/MintableToken.sol

@@ -2,7 +2,7 @@ pragma solidity ^0.4.21;
 
 import "./StandardToken.sol";
 import "../../ownership/Ownable.sol";
-
+import "zos-lib/contracts/migrations/Migratable.sol";
 
 /**
  * @title Mintable token
@@ -10,7 +10,7 @@ import "../../ownership/Ownable.sol";
  * @dev Issue: * https://github.com/OpenZeppelin/zeppelin-solidity/issues/120
  * Based on code by TokenMarketNet: https://github.com/TokenMarketNet/ico/blob/master/contracts/MintableToken.sol
  */
-contract MintableToken is StandardToken, Ownable {
+contract MintableToken is Migratable, Ownable, StandardToken {
   event Mint(address indexed to, uint256 amount);
   event MintFinished();
 

contracts/token/ERC20/TokenTimelock.sol

@@ -1,14 +1,14 @@
 pragma solidity ^0.4.21;
 
 import "./SafeERC20.sol";
-
+import "zos-lib/contracts/migrations/Migratable.sol";
 
 /**
  * @title TokenTimelock
  * @dev TokenTimelock is a token holder contract that will allow a
  * beneficiary to extract the tokens after a given release time
  */
-contract TokenTimelock {
+contract TokenTimelock is Migratable {
   using SafeERC20 for ERC20Basic;
 
   // ERC20 basic token contract being held
@@ -20,7 +20,7 @@ contract TokenTimelock {
   // timestamp when token release is enabled
   uint256 public releaseTime;
 
-  function TokenTimelock(ERC20Basic _token, address _beneficiary, uint256 _releaseTime) public {
+  function initialize(address _sender, ERC20Basic _token, address _beneficiary, uint256 _releaseTime) public isInitializer("TokenTimelock", "0") {
     // solium-disable-next-line security/no-block-members
     require(_releaseTime > block.timestamp);
     token = _token;

contracts/token/ERC20/TokenVesting.sol

@@ -6,6 +6,7 @@ import "./ERC20Basic.sol";
 import "./SafeERC20.sol";
 import "../../ownership/Ownable.sol";
 import "../../math/SafeMath.sol";
+import 'zos-lib/contracts/migrations/Migratable.sol';
 
 
 /**
@@ -14,7 +15,7 @@ import "../../math/SafeMath.sol";
  * typical vesting scheme, with a cliff and vesting period. Optionally revocable by the
  * owner.
  */
-contract TokenVesting is Ownable {
+contract TokenVesting is Migratable, Ownable {
   using SafeMath for uint256;
   using SafeERC20 for ERC20Basic;
 
@@ -42,7 +43,8 @@ contract TokenVesting is Ownable {
    * @param _duration duration in seconds of the period in which the tokens will vest
    * @param _revocable whether the vesting is revocable or not
    */
-  function TokenVesting(
+  function initialize(
+    address _sender,
     address _beneficiary,
     uint256 _start,
     uint256 _cliff,
@@ -50,7 +52,10 @@ contract TokenVesting is Ownable {
     bool _revocable
   )
     public
+    isInitializer("TokenVesting", "0")
   {
+    Ownable.initialize(_sender);
+
     require(_beneficiary != address(0));
     require(_cliff <= _duration);
 

contracts/token/ERC721/ERC721Token.sol

@@ -2,6 +2,7 @@ pragma solidity ^0.4.21;
 
 import "./ERC721.sol";
 import "./ERC721BasicToken.sol";
+import "zos-lib/contracts/migrations/Migratable.sol";
 
 
 /**
@@ -10,7 +11,7 @@ import "./ERC721BasicToken.sol";
  * Moreover, it includes approve all functionality using operator terminology
  * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
  */
-contract ERC721Token is ERC721, ERC721BasicToken {
+contract ERC721Token is Migratable, ERC721, ERC721BasicToken {
   // Token name
   string internal name_;
 
@@ -35,7 +36,7 @@ contract ERC721Token is ERC721, ERC721BasicToken {
   /**
    * @dev Constructor function
    */
-  function ERC721Token(string _name, string _symbol) public {
+  function initialize(address _sender, string _name, string _symbol) public isInitializer("ERC721Token", "0") {
     name_ = _name;
     symbol_ = _symbol;
   }