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.
Don't forget to start each sentence on a new line, namely "They need to run..."
Also, this sentence is a bit confusing, does "They" refer to BlackEasy.py and BlackHard.py? It may be more clear to say "They need to be run from the command line using \li{python <<filename>><<numberofgames>}"