Release v0.9.15

- API: Fix error when trying to use v2.1 saying that that version is not
  supported even though it is
- Add docker-compose file to easily spin up a demo instance
- Update to current Bootstrap CSS framework version
-----BEGIN PGP SIGNATURE-----
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=yfin
-----END PGP SIGNATURE-----