Add Ruby 2.1.0 to Travis CI mix.
Move rubinius dependencies from gemspec to Gemfile.
For rubinius, require json gem in Gemfile.
move .gemspec to rdf-json.gemspec.
Change plugin to extension.
Rewind input when reading and use DOAP file for updated reader tests.
Update travis config.
Finish rspec3.0
(Finally) update to RDF 1.1 version with application/rdf+json mime-type and .nj extension.
Version 1.1.1.
Extension is .rj, not .nj. Format symbol remains :json.
Extension is .rj, not .nj. Format symbol remains :json.
Release 1.1.1

* (Finally) update to RDF 1.1 version with application/rdf+json mime-type and .rj extension.