Consolidate logging.getLogger() calls

Move the self.logger = logging.getLogger() calls to the
base class
core: replace image to gain full open source compability

The old image has no open source licence (or at least: we where not in
the ability to determine the current licence). Therefore this patch
replace the image by a new. The image was modified by add alpha channel
aka remove the white background.

The original image was licenced under Creative Commons Attribution-Share
Alike 3.0 Unported. The original source can be found here:

https://en.wikipedia.org/wiki/File:Sperry-univac-uniscope-200-0a.jpg

Signed-off-by: Hagen Paul Pfeifer <hagen@jauu.net>