Move standalone ERC20 and ERC721 to token dir (#38)

contracts/examples/StandaloneERC20.sol → contracts/token/ERC20/StandaloneERC20.sol

 pragma solidity ^0.4.24;
 
 import "zos-lib/contracts/Initializable.sol";
-import "../token/ERC20/ERC20Detailed.sol";
-import "../token/ERC20/ERC20Mintable.sol";
-import "../token/ERC20/ERC20Pausable.sol";
+import "./ERC20Detailed.sol";
+import "./ERC20Mintable.sol";
+import "./ERC20Pausable.sol";
 
 
 /**
@@ -12,7 +12,7 @@ import "../token/ERC20/ERC20Pausable.sol";
  */
 contract StandaloneERC20 is Initializable, ERC20Detailed, ERC20Mintable, ERC20Pausable {
   function initialize(
-    string name, string symbol, uint8 decimals, uint256 initialSupply, address initialHolder, 
+    string name, string symbol, uint8 decimals, uint256 initialSupply, address initialHolder,
     address[] minters, address[] pausers
   ) public initializer {
     require(initialSupply > 0);

contracts/examples/StandaloneERC721.sol → contracts/token/ERC721/StandaloneERC721.sol

 pragma solidity ^0.4.24;
 
 import "zos-lib/contracts/Initializable.sol";
-import "../token/ERC721/ERC721.sol";
-import "../token/ERC721/ERC721Enumerable.sol";
-import "../token/ERC721/ERC721Metadata.sol";
-import "../token/ERC721/ERC721MetadataMintable.sol";
-import "../token/ERC721/ERC721Pausable.sol";
+import "./ERC721.sol";
+import "./ERC721Enumerable.sol";
+import "./ERC721Metadata.sol";
+import "./ERC721MetadataMintable.sol";
+import "./ERC721Pausable.sol";
 
 
 /**
  * @title Standard ERC721 token, with minting and pause functionality.
  *
  */
-contract StandaloneERC721 
-  is Initializable, ERC721, ERC721Enumerable, ERC721Metadata, ERC721MetadataMintable, ERC721Pausable 
+contract StandaloneERC721
+  is Initializable, ERC721, ERC721Enumerable, ERC721Metadata, ERC721MetadataMintable, ERC721Pausable
 {
   function initialize(string name, string symbol, address[] minters, address[] pausers) public initializer {
     ERC721.initialize();

test/examples/StandaloneERC20.test.js → test/token/ERC20/StandaloneERC20.test.js

 const encodeCall = require('zos-lib/lib/helpers/encodeCall').default;
-const { shouldBehaveLikeERC20Mintable } = require('../token/ERC20/behaviors/ERC20Mintable.behavior');
-const { assertRevert } = require('../helpers/assertRevert');
+const { shouldBehaveLikeERC20Mintable } = require('./behaviors/ERC20Mintable.behavior');
+const { assertRevert } = require('../../helpers/assertRevert');
 
 const BigNumber = web3.BigNumber;