2.0 Beta Release

Updates for RDF.rb 2.0 Beta

• Handle Enumerable values on Repository#delete
  • A test for RDF::Enumerable inputs was added by ruby-rdf/rdf-spec#39. This adds conformance, and allows SPARQL::Client::Repository to use the new Mutable#delete_insert interface. It does not yet implement an efficient SPARQL #delete_insert.
• It may be possible to refactor #delete_statements in response to these changes, to remove the code smells called out in the comment in that method.
• Change calling sequence to Repository to use uri named parameter instead of fixed endpoint parameter.
• Change pattern of uri named parameter for backwards compatibility with earlier versions of Ruby 2.x