test cards

testing methods for check, bet, raise
update pokerstrat
corrected stake-pot.to_play error
Rename cards2.7.4.py to cards2.7.4_test.py
latest changes to Hand methods & pokerstrat

need to fix list error if only one player is in refund round
rename 2.7.4
renamed to cards v2.8
Merge pull request #6 from philipok-1/Experimental

Experimental merge test