Fixed: Memory leak in CPTableView, CPScrollView

Prevously, when removing a CPTableView or a CPScrollView, the CPNotificationCenter kept a reference of these observers in the notification center.

Now, the CPNotificationCenter does only have a observer when necessary.
Fixed: removed useless comment in CPClipView.j
Fixed: Memory leak in CPClipView

Previously, the CPClipView registered the documentView to the notificationCenter as an observer to be notified when the frame/bounds of the  documentView change.

Now, we don't use the notificationCenter anymore. The class CPView send a message to its superview (when it's a clipView) when the frame or bounds change. This fix the memory leak of the CPClipView

Fixed #2264
Merged of CPCLipView
Fixed: leak memory with CPTableViews delegate
Fixed: _postDidResizeNotificationWithOldWidth does not exists anymore, replace by _didResizeTableColumn:tableColumn:oldWidht:
Fixed: memory leak when using a delegate with a CPComboBox
Fixed: memory leaks when using a delegate with a CPTextField
Merge branch 'master' of https://github.com/cappuccino/cappuccino
Merged conflict in CPComboBox
Fixed: change == to === on CPTextField when assigning a delegateo
Fixed: warning raised by the compiler due to unknown type in var declarations
Fixed: memory leak in CPComboBox

Previously, when assigning a listDelegate to a CPComboBox, we never deleted the observers added by this method. Now we add and delete these observers in the method addObservers and removeObservers.

This PR fix another issue. Previously, the behavior of the panel of the comboBox wasn't the same as the one in Cocoa. Now, when closing the panel, the hit view won't be the first responder as it was. Cocoa works like this as well.
Fixed: issue when opening a popUpList of a CPComboBox. We now firstly open the panel and then we modify the content of the panel, this occured an issue with the rendering of the view
Fixed: method addObservers and removeObservers were not call all the time when ordering or not a window
Style: style in CPWindow
Fixed: type with the method _windowWillBeAddedToTheDOM in CPWindow
Fixed: notifications CPWindowDidResignKeyNotification and CPWindowDidBecomeKeyNotification were not registered for a firstresponder textField when ordered again a window
Test: added class notificationHelper with the method registeredNotificationsForObserver
Test: added tests for CPComboBox