Add Accordion control from https://github.com/hugoabernier/AccordionWebPart

[sadomovalex]

Q	A
Bug fix?	[ ]
New feature?	[x ]
New sample?	[ ]
Related issues?	fixes #X, partially #Y, mentioned in #Z

What's in this Pull Request?

Add Accordion control from https://github.com/hugoabernier/AccordionWebPart

[AJIXuMuK]

Hi @sadomovalex!
Thank you for the new control!

One question: what's the main reason to base it on v2 version? While we're still on v1, could it be added to v1?

[estruyf]

@AJIXuMuK it is because of the dependency of Office UI Fabric 6.

[AJIXuMuK]

@estruyf do you see the reason for that?
I looked at the code and it seems like it could be based on v5.

[estruyf]

Indeed, seems just because the usage of DefaultButton.

[estruyf]

If we replace that, we can make it happen in v1.

[estruyf]

ok, seems that it was just a couple of properties that have been renamed. I made changes so that it works fine in v1. Thanks, @sadomovalex for this PR.

[sadomovalex]

Great, it is even better!

[sadomovalex]

@AJIXuMuK I'm not author of this control. Your thanks should go to @hugoabernier :) I just wanted to make it available with less efforts directly from npm)