#51 Allow extensions to the resolution process in a modular way

[Peter Ansell]

Extensions to the resolution process should be modular so they can be extended without extra core coding being required to integrate a new process, such as SOAP web service call for example.

This needs to be done by dynamically interpreting the resolutionMethod predicate in each Provider, and linking it to a module, which then also needs to recognise one or more of the predicates on the Query Type, such as SparqlTemplateString for example.