Add python-setuptools build dependency.
Create a default build target that does nothing.
Fix Makefile.

  - Use tabs instead of spaces.
  - Die with a useful error message if DESTDIR is not set.
  - Fix order of arguments to tar.
Install files in /usr, not /usr/local.
Depend on any of zfs-fuse, debian-zfs or ubuntu-zfs.
Merge pull request #9 from nwalfield/master

Make it build on Debian (Wheezy).