Add Graphie.Line and Graphie.Label

Summary:
Adds two new <Graphie> components, Line and Label.

Also passes a `graphie` parameter to the function used in
Graphie.createSimpleClass so that it's actually usable :).

Test Plan: Used in numberline refactor

Reviewers: alex

Reviewed By: alex

Differential Revision: http://phabricator.khanacademy.org/D9137