Disabled AutoInline mode for CKEditor.
Removed trailing comma to please older browsers.
Fixed another regression introduced by #2284955.

The current document should still be used as the context for fetching
a field by id, to ensure the parent form is still part of it.
Reworded filter recommendations in readme.
Refactored wysiwygAttach(), wysiwygDetach() and #resizable handling.

They methods are now safe to call repeatedly and will always produce the same
result. The value of #resizable is no longer overridden by Wysiwyg.
Improved behavior when wysiwyg.js is included twice.