Move bidirectional binding/unbinding into proper context. Make sure that bypasse…

…d bindings with dependencies will get unbinded properly.

@@ -78,6 +78,9 @@ class Rivets.Binding
       Rivets.config.adapter.subscribe @model, @keypath, @sync
       @sync() if Rivets.config.preloadData
 
+      if @isBidirectional()
+        bindEvent @el, 'change', @publish
+
     if @options.dependencies?.length
       for dependency in @options.dependencies
         if /^\./.test dependency
@@ -90,21 +93,19 @@ class Rivets.Binding
 
         Rivets.config.adapter.subscribe model, keypath, @sync
 
-    if @isBidirectional() and not @options.bypass
-      bindEvent @el, 'change', @publish
 
   # Unsubscribes from the model and the element.
   unbind: =>
     unless @options.bypass
       Rivets.config.adapter.unsubscribe @model, @keypath, @sync
 
+      if @isBidirectional()
+        @el.removeEventListener 'change', @publish
+
     if @options.dependencies?.length
       for keypath in @options.dependencies
         Rivets.config.adapter.unsubscribe @model, keypath, @sync
 
-      if @isBidirectional()
-        @el.removeEventListener 'change', @publish
-
 # A collection of bindings built from a set of parent elements.
 class Rivets.View
   # The DOM elements and the model objects for binding are passed into the