Added resizeModifier for selectively adding or removing specific fitText() calls

[Sawtaytoes]

Helps with responsive designs where at certain breakpoints the resize operation should no longer take place regardless of a minimum or maximum font-size.

[davatron5000]

Thanks @Saturn2888 for the commit. This seems really specific to your current implementation and JS breakpoint management dependencies. Would you mind giving some background?

[Sawtaytoes]

I'm having trouble remembering exactly why this was important so my description here may be lacking.

I remember needing to control FitText.js on particular items independently so it was able to be enabled and disabled using jQuery.off() and $.fitText().

I think I did this to add a method of changing the font-size based on the breakpoint rather than a min or max value; although, I remember there was something else I was hitting up against on a few projects which is why I eventually came to this solution.

It allowed me to disable and enable FitText.js selectively rather than globally. When using it on a bunch of different items, This was very useful. Another benefit I can see is there's no need to constantly eyeball the min or max font sizes.