allow matched double quotes in link definition title (markdown.pl beh…

…avior).

Test literal_quotes_in_titles now passes.
fixup! c3e0059

lib/marked.js

@@ -29,7 +29,7 @@ var block = {
 };
 
 block._label = /(?:\\[\[\]]|[^\[\]])+/;
-block._title = /(?:"(?:\\"|[^"])*"|'\n?(?:[^'\n]+\n?)*'|\([^()]*\))/;
+block._title = /(?:"(?:\\"|[^"]|"[^"\n]*")*"|'\n?(?:[^'\n]+\n?)*'|\([^()]*\))/;
 block.def = replace(block.def)
   ('label', block._label)
   ('title', block._title)