* Added a VolumeCreationFailure exception, which is raised on Instance creation if the volume doesn't prov.
* Casted the flavorid in the flavor view code to a string to ensure it works in fake mode.
* Changed the Guest code to save the volume info in fstab.
* Split the VolumeHelper into VolumeDevice and VolumeMountPoint classes.
* Changed fake mode to work when no volume is given.