added log4net support

Added log4net support.
Sometimes when my girl uses the quizzer she complains that it says wrong
even when she know it was right. Many of these times it has been a typo
on my part in the correct answers, but more times then she is willing to
admit she actually gave the wrong answer.

Now the quizzer writes an info level log file where it states it's
actions such as "starting with blah blah blah conditions", and an entry
for each CORRECT and WRONG evaluation. That way I can easialy see when I
am in the wrong, or what typo mistakes she is most frequent at and help
here correct those.