Add logging information

For better understanding of what is going on when Sidekiq executes the
tasks I am starting to put logging statements into the code.

Signed-off-by: Konrad Reiche <konrad.reiche@gmail.com>
Configure custom logger

I have added a custom logger which task is to configure the format of
the logging output. This one uses different colors.

Signed-off-by: Konrad Reiche <konrad.reiche@gmail.com>