renamed indexes and fkey constraints to prevent naming colisions.
moved the CREATE TABLE statement for the school table before the user table. changed ON UPDATE/DELETE triggers from CASCASE to RESTRICT.
added migration for adding uniqueness and foreign-key constraints to the "program_year_steward" table. refs #3236
bumped migration version number. refs #3236
added fkey and uniqueness constraints to program_year_steward table definition. refs #3236
fixed copy/paste error. doh!
Merge pull request #140 from ucsflibtopfstedt/feat3236

see rm ticket 3236
fixed migration.