Added Scraper, changes to elo.py

Elo.py now calculates the ratings for every game in the set
(all data from 2001 onwards takes less than a second to process)
Teams are added dynamically
Loading the csv added by the scraper
Scraper will grab slowly all the data it can from nfl.com and create a
csv file for use in the elo creator.
Scraper Range and Linechart output

Fixed issue with range excluding all of 2012
Fixed the output of the csv to better be formatted for line charts