Removed debug output

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Added test case for issue #27

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Added regex to recognize when the output says that results are incorrect

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Fix issue #27 by unifying exceptions and do not use RuntimeError anymore

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Added hint that binary might not be executable if the error code indicates it

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