Re-add `@articulate/` prefix to NPM package.

[mgreystone]

Re-add the @articulate/ prefix to the npm package. It looks to have been removed in 0.1.3. This results in two separate, out-of-sync packages--one managed by Articulate, one not.

• https://www.npmjs.com/package/tinygen
• https://www.npmjs.com/package/@articulate/tinygen