Fixed broken link; http://gembundler.com/v0.9/deploying.html works, but
http://gembundler.com/v1.0/deploying.html does not; http://gembundler.com/deploying.html points to latest version.
Killed a comma.
gems provide "executables", they are rarely also "binaries"
Add 0.9 to 1.0 note about Passenger
Refactor UPGRADING out of README, add 0.9 → 1.0 notes