add support for nodejs require in clientside util and rpc modules

www/common/common-util.js

@@ -1,7 +1,5 @@
 (function (window) {
-define([], function () {
-    var Util = window.CryptPad_Util = {};
-
+    var Util = {};
     Util.mkAsync = function (f) {
         return function () {
             var args = Array.prototype.slice.call(arguments);
@@ -349,6 +347,14 @@ define([], function () {
         return false;
     };
 
-    return Util;
-});
-}(self));
+    if (typeof(module) !== 'undefined' && module.exports) {
+        module.exports = Util;
+    } else if ((typeof(define) !== 'undefined' && define !== null) && (define.amd !== null)) {
+        define([], function () {
+            window.CryptPad_Util = Util;
+            return Util;
+        });
+    } else {
+        window.CryptPad_Util = Util;
+    }
+}(typeof(self) !== 'undefined'? self: this));

www/common/rpc.js

@@ -1,9 +1,5 @@
-define([
-    '/common/common-util.js',
-    '/bower_components/tweetnacl/nacl-fast.min.js',
-], function (Util) {
-    var Nacl = window.nacl;
-
+(function () {
+var factory = function (Util, Nacl) {
     var uid = Util.uid;
     var signMsg = function (data, signKey) {
         var buffer = Nacl.util.decodeUTF8(JSON.stringify(data));
@@ -337,4 +333,18 @@ types of messages:
     };
 
     return { create: create, createAnonymous: createAnonymous };
-});
+};
+
+    if (typeof(module) !== 'undefined' && module.exports) {
+        module.exports = factory(require("./common-util"), require("tweetnacl"));
+    } else if ((typeof(define) !== 'undefined' && define !== null) && (define.amd !== null)) {
+        define([
+            '/common/common-util.js',
+            '/bower_components/tweetnacl/nacl-fast.min.js',
+        ], function (Util) {
+            return factory(Util, window.Nacl);
+        });
+    } else {
+        // I'm not gonna bother supporting any other kind of instanciation
+    }
+}());