- apply new method naming convention, use p_ as prefix for
  "protected" methods
- allow option for KIWIManager*::setupUpgrade() to operate
  in a mode which checks only for the requested package
  transactions and allow to skip the dist upgrade. This mode
  is used in the kiwi --create step to prevent auto dist
  upgrades which should only happen if kiwi --upgrade is
  called
- improve the KIWI*Builder framework
  + rename the ImageBuilder class to ImageBuilderBase to
    indicate base class status of the implementation
  + rename methods according to naming convention
  + add checksum creation capabilities to the
    ImageBuilderBase class
- add method to execute images.sh explicitly to the Image class
  + the image class will transition to only represent the
    unpacked image. The new methods executes images.sh in
    the unpacked image tree
  + fixup the destructor to avoid "uninitialized" messages
    from Perl if object creation fails
- improve the container build
  + run images.sh file
  + create a checksum for the container file
- add naming convention to the developer documentation
- fix up the pre-commit hook script to deal with file
  removal or renames. When moving/renaming or renaming
  a file, git still presents the old file name as "changed"
  previously this would break the code checking the
  modified files. Compile errors, registration errors,
  and perlcritic errors would be generated
- add entry to container configuration file indicating
  device handling. This is lxc version dependent and kiwi
  does not know the host where the container is deployed,
  thus we cannot add the setting to the configuration
  without guard
- create unit tests for the ImageBuilderBase class
- create a rudimentary unit test for the Image class