Added Class 6 HW

At last fixed local GA DS DC 2 repo. Pushing Class 6 HW. Thanks! -AV
This code is a bit clunky... it is recommended to avoid use of "for i in range(1234)" when possible. I actually find it easier to come up with a good list comprehension using health_1 rather than health_2:
male_list = [float(row[2]) for row in health_1 if row[1] == "M"]

Here's a good link about the use of range:
http://lignos.org/py_antipatterns/