Added rake
Updated rspec to 2.13.0
Add ruby 2.0.0 to the build matrix
Update nokogiri to 1.5.9
Merge pull request #20 from jcoyne/add_rake

Added rake
Merge pull request #21 from jcoyne/update_rspec

Updated rspec to 2.13.0
Merge pull request #23 from jcoyne/update_nokogiri

Update nokogiri to 1.5.9
Merge remote-tracking branch 'refs/remotes/origin/master'
Replace N3 with Turtle when testing.