Specs to describe the weekly schedule behavior
Implement weekly schedule API call
Implement the SportsDataApi::Nfl::Venue for a Game
Implement the SportsDataApi::Nfl::Broadcast
Implement the SportsDataApi::Nfl::Weather
Extract more information for Games in Nfl::weekly
Extract more Week information for Nfl::schedule
Provide year, season and week information to Game
Partially implment link convience methods

The API sometimes provides 'link' convience methods. For quickly
retrieving the play-by-play of a game, or the game statistics. These
additions provide compariable functionality. But use the Ruby methods
instead of returning the raw XML.
Merge pull request #3 from RLovelett/nfl-weekly-schedule

Implement NFL Weekly Schedule

There are still some convenience methods that still need to be implemented (e.g., Game#statistics, Game#pbp, etc). But those cannot be implemented until the corresponding Nfl method is implemented. And beyond that these methods are not 'required' they would just be nice convenience methods.