This patch addresses issue #466 to enable get/setStackTrace on java.lang.Throwable.  It does not add any support for GWT filling in stack traces in web mode.

Patch by: sandymac (+tweaks by me)
Review by: ecc


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@453 8db76d5a-ed1c-0410-87a9-c151d255dfc7