Add player IDs to play-by-play

[perceptualJonathan]

In the play-by-play files, would it be possible to add player IDs? So, for example, there are currently "passer_player_name", "rush_player_name", etc. columns, but no column for the ID for these players, which leads to some issues. To illustrate, the 2014 play-by-play file refers to "Matt Dayes", but the corresponding roster entry is "Matthew Dayes". Adding the ID of "549935" to the play-by-play file would easily resolve any issues.