Add reputation to post struct

ethereum/contracts/core/Forum.sol

@@ -8,6 +8,7 @@ struct Post {
     address sender;
     address author;
     string contentId;
+    uint reputation;
     // TODO: citations
 }
 
@@ -32,6 +33,7 @@ contract Forum is Reputation {
 
     function _onValidatePost(uint postIndex, uint amount) internal {
         Post storage post = posts[postIndex];
+        post.reputation = amount;
         _update(address(this), post.author, amount);
     }
 }