Update Blackjack Lab

Updated the solutions. Removed randomness tests. Combined Mersenne twister with LCG. Cleared up the Blackjack section to be more comprehensive and understandable for students.
Just so you know, there should be a space between any comma separated list in python code, including array shapes. Pep 8 can give you more details for a complete list of the rules, see http://legacy.python.org/dev/peps/pep-0008/.