Better failure reporting.

[bmeike]

This code: https://github.com/couchbaselabs/BLIP-Cpp/blob/0a6346a133860967b4492e6e731843ae9b453587/src/websocket/WebSocketProtocol.hh#L413 ... silently force-closes the connection on failure. It provides the client with absolutely no information about why it is doing so.

The code should at least log the problems (separately).

Better still, it should supply an error to to the client close method, giving the reason for the problem (and, probably, suggesting ProtocolType.BYTE_STREAM)