Updates for RDF 1.1.
Remove 1.8.x support and preliminary update for VERSION.
Update dependencies for RDF 1.1. Use json gem instead of json_pure, as json is built into all rubies now.
Update to RSpec expect syntax and use webmock for remote resources.
Update travis to run unrestricted version of JRuby
Add rdf-aggregate-repo to Gemfile.
Revert use of Enumerator for solutions.
Update Travis test matrix to use rbx instead of rbx-mode19
Finish 1.1.0