Merge pull request #51 from kleros/fix/small-fixes

feat(ForeignProxyAppeals): store dispute block

contracts/src/RealitioForeignArbitrationProxyWithAppeals.sol

@@ -78,6 +78,7 @@ contract RealitioForeignArbitrationProxyWithAppeals is IForeignArbitrationProxy,
     mapping(uint256 => DisputeDetails) public disputeIDToDisputeDetails; // Maps external dispute ids to local arbitration ID and requester who was able to complete the arbitration request.
     mapping(uint256 => bool) public arbitrationIDToDisputeExists; // Whether a dispute has already been created for the given arbitration ID or not.
     mapping(uint256 => address) public arbitrationIDToRequester; // Maps arbitration ID to the requester who was able to complete the arbitration request.
+    mapping(uint256 => uint256) public arbitrationCreatedBlock; // Block of dispute creation. arbitrationCreatedBlock[disputeID]
 
     /* Modifiers */
 
@@ -182,6 +183,7 @@ contract RealitioForeignArbitrationProxyWithAppeals is IForeignArbitrationProxy,
 
                 arbitrationIDToDisputeExists[arbitrationID] = true;
                 arbitrationIDToRequester[arbitrationID] = _requester;
+                arbitrationCreatedBlock[disputeID] = block.number;
 
                 // At this point, arbitration.deposit is guaranteed to be greater than or equal to the arbitration cost.
                 uint256 remainder = arbitration.deposit - arbitrationCost;