Use HTTP/1.1 in websocket server for compatibility with Firefox and Safari

Noticed this while testing out some new webextension changes on Firefox.

I get the following errors:

Snowflake: WebRTC DataChannel opened! snowflake.js:1154:13
Firefox can’t establish a connection to the server at wss://snowflake.bamsoftware.com/?client_ip=45.72.156.47. snowflake.js:1090:11
Snowflake: websocket-relay error. snowflake.js:1154:13
Snowflake: websocket-relay closed.

This are reproducible with a clean master branch.

I'm also getting several bootstraps to 10% during my client tests that aren't going through my proxy so I'm guessing others are having the same problem.