Config file parameter gets overwritten when creating ConfigParser object

Since we were re-using the 'config' variable name, the config file parameter was being overwritten when creating the ConfigParser object. Line 26 would throw a ```TypeError: iteration over non-sequence``` exception since it was trying to read from itself.

I'm not sure if you had a preference between re-naming the parameter or the ConfigParser object. Feel free to change it to match your style.