add Function.js, some updates in OxJS

source/Ox/js/Object.js

@@ -31,6 +31,17 @@ Ox.keyOf = function(obj, val) {
     return key;
 };
 
+/*@
+Ox.methods <f> Returns a sorted list of all method names of an object
+    > Ox.methods({a: [], b: false, f: function() {}, n: 0, o: {}, s: ''})
+    ['f']
+@*/
+Ox.methods = function(obj) {
+    return Object.keys(obj).filter(function(key) {
+        return Ox.isFunction(obj[key]);
+    }).sort();
+};
+
 /*@
 Ox.serialize <f> Parses an object into query parameters
     > Ox.serialize({a: 1, b: 2, c: 3})