npgsql - Npgsql2: [#1011044].

Log Message:
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[#1011044]. Fixed missing NpgsqlDataReader.GetTimeSpan() method.
Added unit test case to cover this method.

Modified Files:
--------------
Npgsql2/src/Npgsql:
NpgsqlDataReader.cs (r1.23 -> r1.24)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/NpgsqlDataReader.cs?r1=1.23&r2=1.24)
Npgsql2/testsuite/noninteractive/NUnit20:
DataReaderTests.cs (r1.14 -> r1.15)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/testsuite/noninteractive/NUnit20/DataReaderTests.cs?r1=1.14&r2=1.15)