Add getStateEvent API (used by IRC AS to get display names for people)

lib/matrix.js

@@ -100,6 +100,21 @@ var init = function(exports){
             );
         },
 
+        getStateEvent: function(roomId, eventType, stateKey) {
+            var pathParams = {
+                $roomId: roomId,
+                $eventType: eventType,
+                $stateKey: stateKey
+            };
+            var path = encodeUri("/rooms/$roomId/state/$eventType", pathParams);
+            if (stateKey !== undefined) {
+                path = encodeUri(path + "/$stateKey", pathParams);
+            }
+            return this._doAuthedRequest(
+                callback, "GET", path, undefined, content
+            );
+        },
+
         sendStateEvent: function(roomId, eventType, content, stateKey, 
                                  callback) {
             var pathParams = {