Add extractStyleBlocks.php smoketest, also add some neat new functionality to TODO.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1471 48356398-32a2-884e-a903-53898d9a118a

TODO

@@ -13,6 +13,10 @@ afraid to cast your vote for the next feature to be implemented!
 
 3.0 release [Go PHP5!]
  - Convert all &$context calls to $context, as PHP5 passes objects by value
+ - Allow extracted CSS blocks to have a bounding selector prepended to all
+   of their declarations. There are two types: a global type and a HTML5
+   scoped type. This will allow for <style> while minimizing the risk of
+   disruption of other parts of site layout,
 
 3.1 release [Error'ed]
  # Error logging for filtering/cleanup procedures