Adding committee jurisdictions

@jplatzer offered to gather committee jurisdictions to help improve GovTrack.

This PR adds the House jurisdictions he gathered so far to `committees-current.yaml`. I think he's going to gather Senate committee jurisdictions too, and possibly subcommittees, and I will update the PR with those when they're done.

Posting here first in case anyone has thoughts before merging.

@jplatzer: Feel free to comment here about it. This project is a shared space for legislative data used by several organizations. And welcome to Github!