Connection string builder



Francisco,

I was having trouble with Npgsql's ability to try protocol version 3, and then fall back to version 2, since NpgsqlConnectionStringBuilder defaulted to version 3. I changed ConnectionStringBuilder to work properly here, , as well as adding a constructor to NpgsqlConnection.

So now, Npgsql once again attempts to automatically fall back to version 2 even when using ConnectionStringBuilder to set up the connection. However, it's broken in another way as well, which I have fixed in PR #83.

-Glen