add Function.js, some updates in OxJS

source/Ox/js/Collection.js

@@ -11,7 +11,6 @@ Ox.avg <f> Returns the average of an array's values, or an object's properties
     > Ox.avg('avg is 0.1')
     0.1
 @*/
-
 Ox.avg = function(obj) {
     return Ox.sum(obj) / Ox.len(obj);
 };
@@ -44,9 +43,8 @@ Ox.copy <f> Returns a (shallow or deep) copy of an object or array
     > Ox.clone(0)
     0
 @*/
-
 Ox.copy = Ox.clone = function(col, deep) {
-    // fixme: remove references to Ox.clone
+    // fixme: copy or clone?
     // fixme: is there any use case for shallow copy?
     var ret = Ox.isArray(col) ? [] : {};
     if (deep) {
@@ -109,7 +107,6 @@ Ox.filter <f> Filters a collection by a given condition
     > Ox.filter(' foo bar ', function(v) { return v != ' '; })
     'foobar'
 @*/
-
 Ox.filter = function(col, fn) {
     var type = Ox.typeOf(col),
         ret = type == 'array' ? [] : type == 'object' ? {} : '';
@@ -285,7 +282,6 @@ Ox.getset <f> Generic getter and setter function
     > Ox.test.object.options({foo: "foo", bar: "bar"}).options()
     {"key": "val", "foo": "foo", "bar": "bar"}
 @*/
-
 Ox.getset = function(obj, args, callback, context) {
     var obj_ = Ox.clone(obj), ret;
     if (args.length == 0) {
@@ -322,6 +318,8 @@ Ox.isEmpty <f> Returns true if a collection is empty
     false
     > Ox.isEmpty(null)
     false
+    > Ox.isEmpty(0)
+    false
     > Ox.isEmpty()
     false
 @*/
@@ -345,7 +343,6 @@ Ox.keys <f> Returns the keys of a collection
     > Ox.keys('abc')
     [0, 1, 2]
 @*/
-
 // fixme: is this really needed? arrays... ok... but strings??
 Ox.keys = function(obj) {
     var keys = [];
@@ -402,47 +399,6 @@ Ox.len = function(col) {
         : type == 'object' ? Ox.values(col).length : void 0;
 };
 
-/*@
-Ox.loop <f> For-loop, functional-style
-    Returning <code>false</code> from the iterator function acts like a
-    <code>break</code> statement. Unlike a <code>for</code> loop,
-    <code>Ox.loop</code> doesn't leak its counter variable to the outer scope,
-    but returns it.
-    (stop, callback) -> <n> Next value
-        equivalent to <code>for (var i = 0; i < stop; i++)</code>
-    (start, stop, callback) -> <n> Next value
-        equivalent to <code>for (var i = start; i < stop; i++)</code> or,
-        if <code>start</code> is larger than <code>stop</code>,
-        <code>for (var i = start; i > stop; i--)</code>
-    (start, stop, step, callback) -> <n> Next value
-        equivalent to <code>for (var i = start; i < stop; i += step)</code> or,
-        if <code>step</code> is negative,
-        <code>for (var i = start; i > stop; i += step)</code>
-    start <n> Start value
-    stop <n> Stop value (exclusive)
-    step <n> Step value
-    callback <f> Iterator function
-        i <n> Counter value
-    > Ox.loop(10, function(i) { return i != 4; })
-    4
-    > Ox.loop(0, 3, 2, function() {})
-    4
-@*/
-Ox.loop = function() {
-    var len = arguments.length,
-        start = len > 2 ? arguments[0] : 0,
-        stop = arguments[len > 2 ? 1 : 0],
-        step = len == 4 ? arguments[2] : (start <= stop ? 1 : -1),
-        callback = arguments[len - 1],
-        i;
-    for (i = start; step > 0 ? i < stop : i > stop; i += step) {
-        if (callback(i) === false) {
-            break;
-        };
-    }
-    return i;
-};
-
 /*@
 Ox.makeArray <f> Takes an array-like object and returns a true array
     Alias for <code>Array.prototype.slice.call</code>
@@ -558,41 +514,6 @@ Ox.min = function(col) {
     return Math.min.apply(Math, Ox.values(col));
 };
 
-/*@
-Ox.range <f> Python-style range
-    (stop) -> <[n]> range
-        Returns an array of integers from <code>0</code> (inclusive) to
-        <code>stop</code> (exclusive).
-    (start, stop) -> <[n]> range
-        Returns an array of integers from <code>start</code> (inclusive) to
-        <code>stop</code> (exclusive).
-    (start, stop, step) -> <[n]> range
-        Returns an array of numbers from <code>start</code> (inclusive) to
-        <code>stop</code> (exclusive), incrementing by <code>step</step>.
-    start <n> Start value
-    stop <n> Stop value
-    step <n> Step value
-    > Ox.range(3)
-    [0, 1, 2]
-    > Ox.range(1, 4)
-    [1, 2, 3]
-    > Ox.range(3, 0)
-    [3, 2, 1]
-    > Ox.range(1, 2, 0.5)
-    [1, 1.5]
-    > Ox.range(-1, -2, -0.5)
-    [-1, -1.5]
-@*/
-Ox.range = function() {
-    var args = Ox.makeArray(arguments),
-        arr = [];
-    args.push(function(i) {
-        arr.push(i);
-    });
-    Ox.loop.apply(null, args);
-    return arr;
-};
-
 /*@
 Ox.setPropertyOnce <f> Sets a property once
     Given a array of objects, each of which has a property with a boolean