Removed NodeNameSet class

spec/oga/node_name_set_spec.rb

@@ -1,11 +0,0 @@
-require 'spec_helper'
-
-describe Oga::NodeNameSet do
-  describe '#initialize' do
-    it 'adds uppercase equivalents of the input strings' do
-      set = described_class.new(%w{foo bar})
-
-      set.to_a.should == %w{foo bar FOO BAR}
-    end
-  end
-end