- improved caching in KIWIMigrate
  * store rpm based data, and re-use by the md5 sum of the database
  * added wait indicator for processing of files
- update information about installed kernel and how to use
  another than the default kernel for the image
- add ruby/gems to the ignore path, that's because we already
  provide gem information in the report by using gem directly
  thus the compiled gem data which is not part of the gem
  package taints the list of unmanaged data