Add scope-specific settings.

[cbrst]

I want different alignment settings depending on the kind of file I'm editing.

For example - I want to align CSS on {. But only CSS. Would look weird if I did that on JS.

Now I can.

[jcmarchi]

Hi @crshd ,

Have you reviewed the indicated conflict with lib/aligner.coffee?

I'd like to see if we can add your contribution to the package. It seems nice.

Thanks.