Add option in ScrollSpy to set the vertical offset

[Chrismuzikos]

A fixed offset of 200px is set in ScrollSpy by default and it should be changed by any user according to its website design.

We can now call :

$('.scrollspy').scrollSpy({ scrollOffsetFix : 55 });

By default, 200px will be used as hardcoded.

[ktamiola]

Excellent! Works like a charm! Thank you!

[acburst]

Thanks for this!