scrub-2.6.1-bp157.1.3

- Update to version 2.6.1
  * Add dist tag to release (TOSS-2665)
  * OS X build/test failrues (issue 31)
  * Minor autotools fixes.
- Update download Url
- Enable parallel building with %{?_smp_mflags}

- imported scrub 2.5.2, a generic disk scrubber with multiple
  government mandated scrub algorithms.