Merge tag 'v2.1.1' of github.com:OpenZeppelin/openzeppelin-solidity

v2.1.1

contracts/mocks/PaymentSplitterMock.sol

@@ -0,0 +1,9 @@
+pragma solidity ^0.4.24;
+
+import "../payment/PaymentSplitter.sol";
+
+contract PaymentSplitterMock is PaymentSplitter {
+    constructor(address[] payees, uint256[] shares) public {
+        PaymentSplitter.initialize(payees, shares);
+    }
+}