Squashed commit of the following:

commit dfe4d46f9abf6b0e96e66370d428da4e283204ce
Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
Date:   Mon May 2 09:59:45 2011 -0400

    SILK file list update

commit 5faf541d86445eb8ce1775ea206e88afe83c7107
Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
Date:   Mon May 2 09:51:29 2011 -0400

    Makefiles update

commit f5d70b3ccbe209cc07a1a604fffca93ea34bc64b
Author: Koen Vos <koen.vos@skype.net>
Date:   Mon May 2 09:50:33 2011 -0400

    SILK stereo update and MSVC build update