fix html comments, again. fixes #381 and #389.

Original commit:
da05668

lib/marked.js

@@ -20,7 +20,7 @@ var block = {
   lheading: /^([^\n]+)\n *(=|-){2,} *(?:\n+|$)/,
   blockquote: /^( *>[^\n]+(\n(?!def)[^\n]+)*\n*)+/,
   list: /^( *)(bull) [\s\S]+?(?:hr|def|\n{2,}(?! )(?!\1bull )\n*|\s*$)/,
-  html: /^ *(?:comment|closed|closing) *(?:\n{2,}|\s*$)/,
+  html: /^ *(?:comment *(?:\n|\s*$)|closed *(?:\n{2,}|\s*$)|closing *(?:\n{2,}|\s*$))/,
   def: /^ *\[([^\]]+)\]: *<?([^\s>]+)>?(?: +["(]([^\n]+)[")])? *(?:\n+|$)/,
   table: noop,
   paragraph: /^((?:[^\n]+\n?(?!hr|heading|lheading|blockquote|tag|def))+)\n*/,