Lowers logging levels

I had previously used the logging.WARNING level to suppress most of the
logger messages, which were at the logging.INFO level.  I downgraded the
levels for all of the messages to logging.DEBUG, and made the default
logger level logging.INFO.  Also modifies the alpha values for test case
1 and 2.
Merge branch 'graphing' of github.com:WalkerMills/network_simulator into graphing