`o.responsiveBreakpoint` is relying on the `defaults` object being overwritten whenever this plugin is called: see #104.

If you set `responsiveBreakpoint` on the sticky object that gets added in `methods.init` – see [code here](https://github.com/garand/sticky/blob/4e88e2aaf6cdfaa74e33690c8b48eaf191438159/jquery.sticky.js#L94-L101) – you can access it here via `s.responsiveBreakpoint` and it will reflect that sticky object rather than an accidentally changed global state.

Line 39 can be removed if this is done: `o = $.extend(defaults);`