Remove a bad use case.
Add the “ping” listener.
Detect a new protocol error: invalid unicode.
[auto] Merge from Websocket

    • #0a76376 — Remove a bad use case. (Ivan Enderlin, 2013-03-12)
    • #113d52d — Add the “ping” listener. (Ivan Enderlin, 2013-03-12)
    • #86a9667 — Detect a new protocol error: invalid unicode. (Ivan Enderlin, 2013-03-13)

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Merge remote branch 'library-websocket/master'