Split send payloads according to firebase's custom continuation format

[andrewparmet]

Hi Uri -

While using firebase-server we noticed that long messages being sent back from the web server were failing on the Java Firebase client. It turns out they have implemented a custom frame-chunking protocol as you can see here: https://github.com/firebase/firebase-admin-java/blob/d4a143801cf73e0de9641d29da9c5e72d1f91944/src/main/java/com/google/firebase/database/connection/WebsocketConnection.java#L124-L217. This PR sends long messages in chunks and fixes our problem.

Thanks for a great tool!

[coveralls]

Coverage increased (+0.07%) to 94.822% when pulling 9c79f6c on andrewparmet:master into 0aa5f5d on urish:master.

[coveralls]

Coverage increased (+0.07%) to 94.822% when pulling 9c79f6c on andrewparmet:master into 0aa5f5d on urish:master.

[coveralls]

Coverage increased (+0.07%) to 94.822% when pulling 9c79f6c on andrewparmet:master into 0aa5f5d on urish:master.

[coveralls]

Coverage increased (+0.07%) to 94.822% when pulling 9c79f6c on andrewparmet:master into 0aa5f5d on urish:master.

[coveralls]

Coverage increased (+0.1%) to 94.855% when pulling d9bbfea on andrewparmet:master into 0aa5f5d on urish:master.

[urish]

Thank! Please see my comment in the code regarding the newline issue.

Basically, I think it will be better just to use simple string operations instead of regexp (less magic)

[andrewparmet]

I don't see a comment but I think I understand the gist of it - please see my rebased commit. Thanks!

[urish]

Looks much better - also comes with a test now. Thank you!