fixed bugs because of wrong handling of the root directory
removed useless comment
VDiskFile.mkdirs implemented
Create directory command (mkdir) has an option -p for creating parents.

It's possible to create a directory structure now:
mkdir /foo/bar/long/way/home
will create a directory "home" within a new directory "way" within a
directory "long" within...
Merge branch 'master' of https://github.com/groggi/eth-jcd
fixed NullPointerException inside StopCommand
implemented renameTo method in VDiskFile.

This method can be used to rename files or/and move them.
Implemented move command for the CLI