Add support for disabled class.

[lindyhopchris]

Hi Alex,

Hope you're well!

Finding this add-on really useful. However, it would be great to add support for adding a disabled class. I've added it but I'm not fussy about the implementation if you need to play around with it!

It's useful for some of the Bootstrap components, where you can add a disabled class to links as the opposite of active.

Cheers,
Chris

[lindyhopchris]

Hi @alexspeller

Any chance this can be merged?

Cheers,
Chris

[alexspeller]

If you want this exact functionality, I would suggest subclassing the component instead and adding it in your subclass. Binding the disabled class from a child link to I'd want to proxy from the child itself but before adding that I'm waiting on #4

[lindyhopchris]

Ah yes, that makes sense: would be good to get it from the child itself. I'll wait for #4 then update this pull request if you want.