[wsrp-wsia] [change request #247] Rename binding wsdl file

Document: wsrp_v1_binding.wsdl

Section: File name

Requested by: Richard Jacob

Old text: wsrp_v1_binding.wsdl

New text: wsrp_v1_bindings.wsdl

Reasoning: the binding WSDL contains
more than one binding, have a consistent nameing schema, see wsrp_v1_interfaces.wsdl
and wsrp_v1_types.wsdl.