added optional 'reverse' parameter to Posts.getPostsByTid and Topics.getTopicPosts (incoming signature adjustment for 0.4x)

src/posts.js

@@ -93,8 +93,13 @@ var db = require('./database'),
 		], callback);
 	};
 
-	Posts.getPostsByTid = function(tid, start, end, callback) {
-		db.getSortedSetRange('tid:' + tid + ':posts', start, end, function(err, pids) {
+	Posts.getPostsByTid = function(tid, start, end, reverse, callback) {
+		if (typeof reverse === 'function') {
+			callback = reverse;
+			reverse = false;
+		}
+
+		db[reverse ? 'getSortedSetRevRange' : 'getSortedSetRange']('tid:' + tid + ':posts', start, end, function(err, pids) {
 			if(err) {
 				return callback(err);
 			}

src/topics.js

@@ -306,8 +306,13 @@ var async = require('async'),
 		});
 	};
 
-	Topics.getTopicPosts = function(tid, start, end, current_user, callback) {
-		posts.getPostsByTid(tid, start, end, function(err, postData) {
+	Topics.getTopicPosts = function(tid, start, end, current_user, reverse, callback) {
+		if (typeof reverse === 'function') {
+			callback = reverse;
+			reverse = false;
+		}
+
+		posts.getPostsByTid(tid, start, end, reverse, function(err, postData) {
 			if(err) {
 				return callback(err);
 			}