update README
2014 offseason rules update (changes since last rules doc update on 3/26/12):
Removed mentions of team defense
Add IR slot rules
Add PS slot rules
Add late add rule to In-Season Free Agency section
Add injury exception vote to Free Agency Auctions section
Add In-season Roster Management and Lineups section
Roster limit section update for IR and PS
Add cross-position scoring allowed by Fantrax