added support booleans in records for in parameters

Hi Raimonds,

we have just started using ruby-plsql-spec as testing tool for our big plsql-based application. Since we are using records and objects massively we added support for booleans in record in parameters. As soon as I get the spec running I will add specs too (the database, environment settings in the spec are a bit special).

We will add missing support for other types as we stumble upon them (as far as ruby-oci8 supports it).

Regards,
Beate