Version 0.3

Default for imagedir changed from ./images to /var/lib/machines (#25)
Added a tmpfs configuration, both global and per-image, to use tmpfs
backing for ephemeral images instead of btrfs snapshots. If the machine is
configured with enough ram and swap, it makes for faster CI runs (#27)
Support non-btrfs image storage, by forcing ephemeral images to use tmpfs
backing instead of btrfs snapshots
Add -C/--config option to specify a config file from command line (#34)
Made non-ephemeral containers transactional on BTRFS: updates are run on a
snapshot of the OS image, which is swapped with the original if the operation
succeeds, or removed without changing the original if it fails (#29)
Run containers with --suppress-sync=yes on systemd >= 250 (#28)
Run commands in container with /dev/null redirectd to stdin, instead of stdin
being a closed file descriptor (#37)
Fixed selection of build-dep command in ARPA-style builds (#38)

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