Resolve "Enable Django admin backend"

Closes #112 (closed)

biscuit/core/admin.py

+from django.contrib import admin
+
+from .models import Group, Person, School, SchoolTerm
+
+
+admin.site.register(Person)
+admin.site.register(Group)
+admin.site.register(School)
+admin.site.register(SchoolTerm)