calpoly/frontend/templates/sponsors/sponsors_index.html: Remove unused code.
Makefile: Use POSIX-compliant syntax for find.
calpoly/frontend/templates/index.html: Remove
trailing </p> tag.
migrations/versions/1fd0ec64a0a4_add_discount_table.py: Remove commented out hash.
migrations/versions/3637c71e7eea_add_sponsors_tables.py: Add message to migration.