added get row and row slicing methods, updated split_data function
Merge remote-tracking branch 'origin/master'

* origin/master:
  all dict moved to _all in season, comment cleaning
  removed redundant fields from Game object for projections and streaks, which are contained in the Game.features dict, also cleaned up comments
  Game.attr changed back to Game.features
  Game.attr changed back to Game.features
  uncommented dbRemove and dbCreate, features dict now called attr for game