Resetting props to enforce isolation

[tbranyen]

Was thinking about how Materialish may benefit from all: initial at the top of each component. I believe I learned about it from ya'll, so I'm curious why you didn't opt for it here. Would you accept a PR that added it?

[jamesplease]

We have it in a few places. I'd be open to adding it to more places.

//cc @JPorry

[tbranyen]

I should have searched the codebase first d'oh. I was checking out avatar and noticed it wasn't there.