Honor maximum websocket frame length

[3rd-Eden]

I was pumping a shit load of information down the wire, and I received

WebSocket frame (at 18446744073709551615 bytes) is too long.

This occurred in Safari 5.1, so it's still using the old drafts. As a result of this, the message was dropped....

[quentinxs]

It also occurs in Safari on iOS 5.0.1

WebSocket frame (at 4294967295 bytes) is too long.

Searching the issue on Google came up with 2 main finds:
Documentation of the problem on iOS - http://dalelane.co.uk/blog/?p=1652
A possible explanation of why it occurs - http://stackoverflow.com/questions/6960500/websocket-versions-and-backwards-compatibility