Patches/changes to make 2014 events load. Teams/parks as fixtures.

Teams and parks should be loaded through `manage.py loaddata` before
loading game data. A new park has been added, so they should be loaded
to existing databases before adding 2014 game data too.

Players are now added to database on demand. This comes at the expense
of knowing their debut date, which has been removed from existing
records.

The parks and teams CSV files will eventually be moved to a different
repo, since none of the management commands use them now. For now,
they're in here simply to have diffs from the original.