Fix unbind in rivets.binders. [Closes #86]

@@ -15,6 +15,7 @@
   <script type="text/javascript" src="matchers.js"></script>
   <script type="text/javascript" src="mock.data.js"></script>
   <script type="text/javascript" src="rivets/binding.js"></script>
+  <script type="text/javascript" src="rivets/binders.js"></script>
   <script type="text/javascript" src="rivets/routines.js"></script>
   <script type="text/javascript" src="rivets/functional.js"></script>
 

+describe("Rives.binders", function() {
+  var context;
+  beforeEach(function() {
+    context = {
+      publish: function() {}
+    }
+  });
+
+  describe("value", function() {
+    var el;
+    beforeEach(function() {
+      el = document.createElement('input');
+    });
+
+    it("unbinds the same bound function", function() {
+      var boundFn;
+      spyOn(el, 'addEventListener').andCallFake(function(event, fn) {
+        boundFn = fn;
+      });
+      rivets.binders.value.bind.call(context, el);
+
+      spyOn(el, 'removeEventListener').andCallFake(function(event, fn) {
+        expect(fn).toBe(boundFn);
+      });
+
+      rivets.binders.value.unbind.call(context, el);
+    });
+  });
+});
\ No newline at end of file

@@ -243,9 +243,9 @@ Rivets.binders =
   checked:
     publishes: true
     bind: (el) ->
-      bindEvent el, 'change', @publish
+      @currentListener = bindEvent el, 'change', @publish
     unbind: (el) ->
-      unbindEvent el, 'change', @publish
+      unbindEvent el, 'change', @currentListener
     routine: (el, value) ->
       if el.type is 'radio'
         el.checked = el.value is value
@@ -255,9 +255,9 @@ Rivets.binders =
   unchecked:
     publishes: true
     bind: (el) ->
-      bindEvent el, 'change', @publish
+      @currentListener = bindEvent el, 'change', @publish
     unbind: (el) ->
-      unbindEvent el, 'change', @publish
+      unbindEvent el, 'change', @currentListener
     routine: (el, value) ->
       if el.type is 'radio'
         el.checked = el.value isnt value
@@ -276,9 +276,9 @@ Rivets.binders =
   value:
     publishes: true
     bind: (el) ->
-      bindEvent el, 'change', @publish
+      @currentListener = bindEvent el, 'change', @publish
     unbind: (el) ->
-      unbindEvent el, 'change', @publish
+      unbindEvent el, 'change', @currentListener
     routine: (el, value) ->
       if el.type is 'select-multiple'
         o.selected = o.value in value for o in el if value?