add deployable erc20 contracts

contracts/token/ERC20/DetailedMintableToken.sol

+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);
+  }
+}

contracts/token/ERC20/DetailedPremintedToken.sol

+pragma solidity ^0.4.21;
+
+import "zos-lib/contracts/migrations/Migratable.sol";
+import "./DetailedERC20.sol";
+import "./MintableToken.sol";
+
+contract DetailedPremintedToken is Migratable, DetailedERC20, StandardToken {
+  function initialize(address _sender, string _name, string _symbol, uint8 _decimals, uint256 _initialBalance) isInitializer("DetailedPremintedToken", "0") {
+    DetailedERC20.initialize(_sender, _name, _symbol, _decimals);
+
+    _premint(_sender, _initialBalance);
+  }
+
+  function _premint(address _to, uint256 _value) internal {
+    balances[_to] += _value;
+    emit Transfer(0, _to, _value);
+  }
+}