npgsql - Npgsql2: Fixed bug when trying to retrieve a date value with

Log Message:
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Fixed bug when trying to retrieve a date value with -infinity value. See more here: http://pgfoundry.org/forum/message.php?msg_id=1005249
Thanks Andrus Moor for bug report and test case and Laurenz Albe for reporting the commit where the infinity date value was added.

Modified Files:
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Npgsql2/src/NpgsqlTypes:
NpgsqlTypeConverters.cs (r1.16 -> r1.17)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/NpgsqlTypes/NpgsqlTypeConverters.cs?r1=1.16&r2=1.17)
Npgsql2/testsuite/noninteractive/NUnit20:
CommandTests.cs (r1.28 -> r1.29)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/testsuite/noninteractive/NUnit20/CommandTests.cs?r1=1.28&r2=1.29)