added myself to the list

[SVN r23918]

more/blanket-permission.txt

@@ -22,3 +22,4 @@ Rene Rivera (grafik/redshift-software.com, rrivera/acm.org)
 Paul Mensonides (pmenso57 -at- comcast.net) (See Boost list message of July 21, 2004 1:12:21 AM EST)
 Multi Media Ltd. (pdimov@mmltd.net)
 Brad King (brad.king -at- kitware.com) (See Boost list message of Wed, 21 Jul 2004 11:15:46 -0400)
+Jeremy Siek (jsiek@osl.iu.edu)