Be compatible with the new readAll() method.

readAll() adds an $offset argument. We then add the protected
isPipeSeekable() method to decide if we are able to read with an offset
or not.
[auto] Merge from Console

    • #8fa8465 — Be compatible with the new readAll() method. (Ivan Enderlin, 2013-08-28)

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Merge remote branch 'library-console/master'