Opera 11 native WebSockets (if enabled) seems to have bad behavior for
the bufferedAmount so add change from websockify project to allow max
bufferedAmount (before send queue is delay) to be configured.
Also, Opera 11 and 10.60 behave like Mozilla regarding the '-' key so
translate it correctly.
If all send data was flushed from the send queue then return true,
otherwise false. This doesn't mean the data won't be sent, just that
it wasn't sent this time and is queued.
Only delay sending data if bufferedAmount is greater than 1000.
This seems to match the intention of the spec better. bufferedAmount
does not mean that we can't send, it's just an indication that the
network is becoming saturated. But Opera 11 native WebSockets seems to
have a bug that bufferedAmount isn't set back to zero correctly so
we'll be a bit more tolerant.
Joel Martin