Jump around two opened windows

[RichardIvan]

Thank you for this amazing package!

I was wondering if you think it'd be possible to add the above.

Nuclide has a feature to Open/Close Working Sets. This works across all opened windows so I'm thinking it cold.

[DavidLGoldberg]

Thanks for the love. I actually had an issue for this open:
#48

I actually just commented on it the other day, I had some ideas, but I'll definitely check out the above. Glad to know they found some way to do it. I left a comment in the other issue that apparently the floobits guys got it to work as well. I unfortunately haven't spent any time towards it. I think some of the refactoring I'm doing (still in progress) and the work that was done in a recent pr #93 should facilitate this a lot.

Basically, I think Treeview, tabs selection and windows should come all relatively soon. Just a hobby/side project of course though, so soon, is probably a month or so :\

Closing, because this should be referenced from #48