Lex open tags with newlines in them.

lib/oga/lexer.rl

@@ -404,6 +404,8 @@ module Oga
       element_head := |*
         whitespace | '=';
 
+        newline => { advance_line };
+
         # Attribute names.
         element_name => { t(:T_ATTR) };
 

spec/oga/lexer/elements_spec.rb

@@ -33,6 +33,14 @@ describe Oga::Lexer do
         [:T_ELEM_NAME, 'p', 1]
       ]
     end
+
+    example 'lex an element with a newline in the open tag' do
+      lex("<p\n></p>").should == [
+        [:T_ELEM_OPEN, nil, 1],
+        [:T_ELEM_NAME, 'p', 1],
+        [:T_ELEM_CLOSE, nil, 2]
+      ]
+    end
   end
 
   context 'elements with attributes' do