Implements a CursorDebugWrapper to enable logging queries to console in debug mode

[RossRogers]

This is a port of django.db.backends.utils.CursorDebugWrapper. Implementing this only incurs a runtime cost when DEBUG=True for the project's settings.

With these edits you can then log to the console by putting this in your settings.py:

LOGGING = {
    'disable_existing_loggers': False,
    'version': 1,
    'handlers': {
        'console': {
            # logging handler that outputs log messages to terminal
            'class': 'logging.StreamHandler',
            'level': 'DEBUG', # message level to be written to console
        },
    },
    'loggers': {
        #'': {
        #    # this sets root level logger to log debug and higher level
        #    # logs to console. All other loggers inherit settings from
        #    # root level logger.
        #    'handlers': ['console'],
        #    'level': 'DEBUG',
        #    'propagate': False, # this tells logger to send logging message
        #                        # to its parent (will send if set to True)
        #},
        'django.db': {
            'level': 'DEBUG',
            'handlers': ['console'],
        },
        # 'django.db': {
        #     # django also has database level logging
        # },
    },
}