fixed tests
change bot algorithm, refs #8751

Squashed commit of the following:

commit 374e0305f710311e395349ac2f4c85950cf604fa
Author: Andor Goetzendorff <goetzend@cs.tum.edu>
Date:   Mon May 27 13:31:54 2013 +0200

    bots algorithms are now based on biased expected returns

commit 30973ec51fd995ed898270dfebe06a73a47e47c7
Author: Andor Goetzendorff <goetzend@cs.tum.edu>
Date:   Fri May 24 19:38:02 2013 +0200

    first steps