add rblock and rhash helpers.

lib/bcoin/block.js

@@ -288,6 +288,10 @@ Block.prototype.getNextBlock = function getNextBlock(chain) {
   return this._nextBlock = next;
 };
 
+Block.prototype.__defineGetter__('rblock', function() {
+  return utils.revHex(this.hash('hex'));
+});
+
 Block.prototype.toJSON = function toJSON() {
   return {
     v: '1',

lib/bcoin/chain.js

@@ -607,7 +607,7 @@ Chain.prototype.getHeight = function getHeight(hash) {
   i = this.index.hashes.indexOf(hash);
   height = this.index.heights[i];
 
-  if (height === null)
+  if (height == null)
     return -1;
 
   return height;

lib/bcoin/tx.js

@@ -1164,6 +1164,16 @@ TX.prototype.getConfirmations = function getConfirmations(chain) {
   return top - height + 1;
 };
 
+TX.prototype.__defineGetter__('rblock', function() {
+  return this.block
+    ? utils.revHex(this.block)
+    : null;
+});
+
+TX.prototype.__defineGetter__('rhash', function() {
+  return utils.revHex(this.hash('hex'));
+});
+
 TX.prototype.toJSON = function toJSON() {
   // Compact representation
   return {