topcoat-button-list component

Dear Topcoat crew,

I've created a topcoat button-list component that can be found here: 
https://github.com/fabricematrat/button-list/tarball/master

I add the need a list of buttons displayed vertically a la jQuery mobile. I hope this PR/component will make its way onto your repository.

++
Fabrice
PS: I've signed the CLA