npgsql - Npgsql2: [#1010558] Added callback to provide client

Log Message:
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[#1010558] Added callback to provide client certificates for ssl authentication.
Thanks Frank Bollack (frank.bollack @nospam@ visapix.de) for patch!

Modified Files:
--------------
    Npgsql2/src/Npgsql:
        NpgsqlConnection.cs (r1.28 -> r1.29)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/NpgsqlConnection.cs.diff?r1=1.28&r2=1.29)
        NpgsqlConnector.cs (r1.27 -> r1.28)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/NpgsqlConnector.cs.diff?r1=1.27&r2=1.28)
        NpgsqlConnectorPool.cs (r1.13 -> r1.14)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/NpgsqlConnectorPool.cs.diff?r1=1.13&r2=1.14)
        NpgsqlClosedState.cs (r1.11 -> r1.12)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/NpgsqlClosedState.cs.diff?r1=1.11&r2=1.12)