Remove source, add search to list of recognized block tags.

A spec 0.31 change we forgot in last release.

Author: jgm

lib/blocks.js

@@ -20,7 +20,7 @@ var reHtmlBlockOpen = [
     /^<[?]/,
     /^<![A-Za-z]/,
     /^<!\[CDATA\[/,
-    /^<[/]?(?:address|article|aside|base|basefont|blockquote|body|caption|center|col|colgroup|dd|details|dialog|dir|div|dl|dt|fieldset|figcaption|figure|footer|form|frame|frameset|h[123456]|head|header|hr|html|iframe|legend|li|link|main|menu|menuitem|nav|noframes|ol|optgroup|option|p|param|section|source|summary|table|tbody|td|tfoot|th|thead|title|tr|track|ul)(?:\s|[/]?[>]|$)/i,
+    /^<[/]?(?:address|article|aside|base|basefont|blockquote|body|caption|center|col|colgroup|dd|details|dialog|dir|div|dl|dt|fieldset|figcaption|figure|footer|form|frame|frameset|h[123456]|head|header|hr|html|iframe|legend|li|link|main|menu|menuitem|nav|noframes|ol|optgroup|option|p|param|section|search|summary|table|tbody|td|tfoot|th|thead|title|tr|track|ul)(?:\s|[/]?[>]|$)/i,
     new RegExp("^(?:" + OPENTAG + "|" + CLOSETAG + ")\\s*$", "i")
 ];