Improved rpm building from tarball

• Improved support for building straight from the tarball
• Improved systemd scripts
• Improved support for older rpm based distributions

0.7.2 pool v28

This release adds the following features:

• Pool versions up to 28
• Support for building on EL5

0.7.1 Pool v26, ARM, ashift setting, mount.zfs for legacy mounts, rootfs with systemd

This release adds the following features:

• Pool version 26
• ARM architecture support
• Setting ashift explicitly at pool creation time
• mount.zfs for legacy mounts
• zfs-fuse can now be used for rootfs with systemd initramfs (also see zfs-fuse-dracut repository)
• Backport of the last of Seth Heeren's commits missing from Emmanuel Anne's tree
• Import of the out-of-tree patches from Fedora packages