Don't chdir to root.

Akuma, by default, seems to [chdir to root](https://github.com/kohsuke/akuma/blob/master/src/main/java/com/sun/akuma/Daemon.java#L165) when forking, which breaks page caching in Rails 2.3 amongst other things. Is there a reason to actually do that?

The proposed commit replaces com.sun.akuma.Daemon with com.sun.akuma.Daemon.WithoutChroot, that doesn't chdir out of the current working directory.