Extended support for Out parameters (and other improvements)

Adds the following functionality:

* support for different types of Out param (not just int/number), the following types are now supported: 

OCCIINT
OCCISTRING
OCCIDOUBLE
OCCIFLOAT
OCCICURSOR
OCCICLOB
OCCIDATE
OCCITIMESTAMP
OCCINUMBER
OCCIBLOB

* support for multiple Out parameters (not just one)

* support for (unstreamed) BLOBs in result sets and as out params

* support for INOUT parameters, the following INOUT types are now supported:

OCCIINT
OCCISTRING
OCCIDOUBLE
OCCIFLOAT
OCCINUMBER

* new test for all of the above

* support for node 0.8 and node 0.10

* updated documentation in README.