Add Ruby 2.1.0 to Travis CI mix.
Fix some rspec issues.
Move Rubinius dependencies from gemspec to Gemfile.
Add WITH_NOKOGIRI to travis test matrix, optionally depending on it in Gemfile.
Version 1.1.1
Finish 1.1.1.
Remove explicit dependency on rdf-microdata to not needlessly pull in Nokogiri dependency.