Fix the tests and export interfaces

protobuf/protobuf-tests.ts

@@ -1,4 +1,5 @@
 /// <reference path="protobuf.d.ts" />
+/// <reference path="../node/node.d.ts" />
 
 import ProtoBuf = require("protobufjs");
 

protobuf/protobuf.d.ts

@@ -4,11 +4,11 @@
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 
 declare module ProtoBuf {
-	interface IBuilder {
+	export interface IBuilder {
 		build: <T>() => T;
 	}
 
-	interface IProtoBufMessage {
+	export interface IProtoBufMessage {
 	    toArrayBuffer(): ArrayBuffer;
 	    toBuffer(): Buffer;
 	}