add deployable erc20 contracts

contracts/token/ERC20/DetailedMintableToken.sol

@@ -0,0 +1,12 @@
+pragma solidity ^0.4.21;
+
+import "zos-lib/contracts/migrations/Migratable.sol";
+import "./DetailedERC20.sol";
+import "./MintableToken.sol";
+
+contract DetailedMintableToken is Migratable, DetailedERC20, MintableToken {
+  function initialize(address _sender, string _name, string _symbol, uint8 _decimals) isInitializer("DetailedMintableToken", "0") {
+    DetailedERC20.initialize(_sender, _name, _symbol, _decimals);
+    Ownable.initialize(_sender);
+  }
+}