client.HaystackClient: Replace print statements with logging.
client.HaystackClient: Replace print statements with logging.

This allows for the log output to go to places other than stdout, in an
interactive session, one can run:

	import logging
	logging.basicConfig(level=logging.DEBUG)

to see logging messages in their Python shell.

ChristianTremblay/pyhaystack,vrtsystems/pyhaystack,ChristianTremblay/pyhaystack