integrating config parser to read config values from a file


Tested it and it works fine locally. Will try running on the cluster next. Sending it out to get some comments from you.

There is a minor issue that i need to figure out yet on how to set the airflow_home from os.environ in airflow.cfg, except that part, i think this change is good.

This file has 2 char indents, let's stick to 4 (PEP8)