add travertine proxy server.

[parkervcp]

Resolves #644

Adds readme for waterfall too.

Basically a find/replace for waterfall.

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Did you branch your changes and PR from that branch and not from your master branch?
  • If not, why?:

New Server Submissions:

1. Does your submission pass tests (server is connectable)?
2. Does your server use a custom docker image?
   • Have you tried to use a generic image?
   • Did you PR the necessary changes to make it work?
3. Have you added the server to the main README.md?
4. x ] Have you added a unique README.md for the server you are adding?