Refactor game-specific models into separate package.

db/migrations/20140526225924_CreateRankings.sql

@@ -2,18 +2,7 @@
 CREATE TABLE rankings (
   teamid INTEGER PRIMARY KEY,
   rank int,
-  rankingpoints int,
-  matchpoints int,
-  autopoints int,
-  rotorpoints int,
-  takeoffpoints int,
-  pressurepoints int,
-  random REAL,
-  wins int,
-  losses int,
-  ties int,
-  disqualifications int,
-  played int
+  rankingfieldsjson text
 );
 
 -- +goose Down