Support for visualization is gone, remove matplotlib dependency

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Fixed style issues

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Added test for issue #4

Closes #4 since it shows that the bug is gone.
Was solved by introducing the RunId equality based on the command line.

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Style improvements

Signed-off-by: Stefan Marr <git@stefan-marr.de>