Updates 1.6 branch-info.txt to reflect today's merge (490:4497,4498:4511).

Note that --accept=postpone has been dropped. svn says there is no such thing.

LGTM from jgw via chat



git-svn-id: https://google-web-toolkit.googlecode.com/svn/releases/1.6@4513 8db76d5a-ed1c-0410-87a9-c151d255dfc7