* add ability to change PKCS11 base methods in order to use vendor defined attributes, return codes and mechanisms
* restructured C code to avoid duplicated code in vendor extension gems
* add gem pkcs11_protect_server to cover many ProtectServer specific extensions
* update test/helper to find newer libsoftokn3
* add task for generating combined docs of PKCS11 and PKCS11::ProtectServer
* changed PKCS11#slots to return all slots of the device by default
* add ability to set/get multiple attributes with Object#[] and Object#[]=