Merge pull request #51 from AugustoL/master

Added Claimable contract as an extension of Ownable

contracts/Claimable.sol

@@ -0,0 +1,26 @@
+pragma solidity ^0.4.0;
+import './Ownable.sol';
+
+/*
+ * Claimable
+ * Extension for the Ownable contract, where the ownership needs to be claimed
+ */
+
+contract Claimable is Ownable {
+  address public pendingOwner;
+
+  modifier onlyPendingOwner() {
+    if (msg.sender == pendingOwner)
+      _;
+  }
+
+  function transfer(address newOwner) onlyOwner {
+    pendingOwner = newOwner;
+  }
+
+  function claimOwnership() onlyPendingOwner {
+    owner = pendingOwner;
+    pendingOwner = 0x0;
+  }
+
+}