FIX migration down (NOT NULL)
Installed DoctrineFixturesBundle.
Generated Admin entity.
Merge branch 'topic/fixture' into topic/admin
Generated School entity.
Merge branch 'topic/fixture' into topic/school
Added fixture for loading sample School data.
Merge branch 'topic/fixture' into topic/user
Created fixture for loading sample User data.
Merge branch 'topic/school' into topic/admin
Merge branch 'topic/user' into topic/admin
Implemented OrderedFixtureInterface for User and School fixtures.
Created fixture for loading sample Admin data.
Merge branch 'topic/setup' into topic/security
Merge branch 'topic/user' into topic/security

Conflicts:
	composer.lock
Adjusted fixture for loading sample User data with encoded passwords.
Established ManyToOne connection between School and Admin.
Established ManyToOne connection between User and Admin.
Fixed Admin data fixture.
Created SchoolController.