Add `autoCancel` flag to indicate that the notification shall be automatically canceled when the user clicks it

App throws an error on iOS if `message` is null. - Removed extra line break on iOS if `title` is null or empty.

Images or sounds must be placed into the res-folder and not into the assets-folder.

Along with Cordova 3.2 and Windows Phone 8 the `version.bat` script has to be renamed to `version`.

The right to play notification sounds in the notification center settings has to be granted.

Pull requests are welcome...