fix problem when having different filename

jquery.wymeditor.js uses a regex to calculate the wymeditor files path.

If `django.contrib.staticfiles.storage.CachedFilesStorage` is used, then the unique generated filename (e.g.: "jquery.wymeditor.3fbe6a76dd28.js") doesn't match the regex.

While this patch fixes it, I don't know what happens if the user decides they're not using django.contrib.staticfiles (well, I do know, it fails).

I don't know if staticfiles is required by django-cms and if there's a safer, more internally-sound way of doing this, but the bottom line is that the `wymPath`, or possibly the `basePath` option should be passed to the `.wymeditor` call