- added "ScrollbarEnabled" to ModalDialog which defaults to true.  Setting it to false allows for a automatically sized dialog (handy if you need a shorter dialog)
- added a little more error handling to CkEditorFileBrowser if unable to get access to the filesystem
- switched CreateFolder's and RenameFolder's ModalDialog to use EnableScrollbar=false.  Fixes an issue where the dialog was too tall, making it impossible to create or rename a folder.