npgsql - Npgsql2: Added a fix for caseinsensitive parameter names in

Log Message:
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Added a fix for caseinsensitive parameter names in query strings. Thanks Antonio Leiva for the patch!

Added test case for this bug.

Also added a pending testcase for NpgsqlInet types returned from NpgsqlDataReader.GetValue(). This test is not working yet because of pending fixes in Npgsql. But the test is ok.

Modified Files:
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Npgsql2/src/Npgsql:
NpgsqlCommand.cs (r1.43 -> r1.44)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/NpgsqlCommand.cs?r1=1.43&r2=1.44)
Npgsql2/testsuite/noninteractive/NUnit20:
CommandTests.cs (r1.33 -> r1.34)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/testsuite/noninteractive/NUnit20/CommandTests.cs?r1=1.33&r2=1.34)