Add tag for the 2.0.4 branch.
$ svn cp https://google-web-toolkit.googlecode.com/svn/releases/2.0@8340 https://google-web-toolkit.googlecode.com/svn/tags/2.0.4


git-svn-id: https://google-web-toolkit.googlecode.com/svn/tags/2.0.4@8590 8db76d5a-ed1c-0410-87a9-c151d255dfc7