Modified so grades are now NULLable integers (simpler and more understandable)
Renamed to School/scripts/populate-student.pl to follow StreetLinks naming conventions
v0.12 - Updated to follow conventions.txt

1) Bumped version to v0.12.
2) Added conventions.txt as the schema conventions used.
3) Updated to follow conventions.txt.
4) Finished switching to grades as a NULLable integer instead of
   a separate table.
5) Added create-db.pl for creating the database. Note that how
   to do this in DBD::Pg is not currently well-documented.
5) Added master script create-deploy-and-fill.pl for creating
   the database, deploying the schema, then filling the database.