Renamed CSS axis tokens.

These have been renamed as following:

T_CHILD => T_GREATER
T_FOLLOWING => T_TILDE
T_FOLLOWING_DIRECT => T_PLUS

spec/oga/css/lexer/axes_spec.rb

@@ -3,52 +3,52 @@ require 'spec_helper'
 describe Oga::CSS::Lexer do
   context 'axes' do
     example 'lex the > axis' do
-      lex_css('>').should == [[:T_CHILD, nil]]
+      lex_css('>').should == [[:T_GREATER, nil]]
     end
 
     example 'lex the expression "> y"' do
-      lex_css('> y').should == [[:T_CHILD, nil], [:T_IDENT, 'y']]
+      lex_css('> y').should == [[:T_GREATER, nil], [:T_IDENT, 'y']]
     end
 
     example 'lex the expression "x > y"' do
       lex_css('x > y').should == [
         [:T_IDENT, 'x'],
         [:T_SPACE, nil],
-        [:T_CHILD, nil],
+        [:T_GREATER, nil],
         [:T_IDENT, 'y']
       ]
     end
 
     example 'lex the + axis' do
-      lex_css('+').should == [[:T_FOLLOWING_DIRECT, nil]]
+      lex_css('+').should == [[:T_PLUS, nil]]
     end
 
     example 'lex the expression "+ y"' do
-      lex_css('+ y').should == [[:T_FOLLOWING_DIRECT, nil], [:T_IDENT, 'y']]
+      lex_css('+ y').should == [[:T_PLUS, nil], [:T_IDENT, 'y']]
     end
 
     example 'lex the expression "x + y"' do
       lex_css('x + y').should == [
         [:T_IDENT, 'x'],
         [:T_SPACE, nil],
-        [:T_FOLLOWING_DIRECT, nil],
+        [:T_PLUS, nil],
         [:T_IDENT, 'y']
       ]
     end
 
     example 'lex the ~ axis' do
-      lex_css('~').should == [[:T_FOLLOWING, nil]]
+      lex_css('~').should == [[:T_TILDE, nil]]
     end
 
     example 'lex the expression "~ y"' do
-      lex_css('~ y').should == [[:T_FOLLOWING, nil], [:T_IDENT, 'y']]
+      lex_css('~ y').should == [[:T_TILDE, nil], [:T_IDENT, 'y']]
     end
 
     example 'lex the expression "x ~ y"' do
       lex_css('x ~ y').should == [
         [:T_IDENT, 'x'],
         [:T_SPACE, nil],
-        [:T_FOLLOWING, nil],
+        [:T_TILDE, nil],
         [:T_IDENT, 'y']
       ]
     end