- allow to control whether kiwi searches for ata raid
  controllers or not using the dmraid utility. This is
  useful if an alternative control tool exists or the
  raid should be ignored in any case:

  <oem-ataraid-scan>true|false</oem-ataraid-scan>

  By default the search and activation happens if dmraid
  is installed. Implemented by user feedback
  request (bnc #815206)
- add hook entry point called: postHWdetect
  * it allows to create/modify your own representation of the
    deviceDisks array containing the found install disk devices
- DB: update documentation
  + added some notes about new postHWdetect hook
  + added some notes about how software raid works in kiwi images
- DB: rebuild documentation