Merge branch 'rassify_database' into 'master'

CONTRIBUTING.md

configfile_doc.json

db/knex_router.js

db/knexfile.js

db/migrations_v2/20181110100101_create_groups.js

...ions_v2/20181110100202_create_childtable_simple_groups.js

...ations_v2/20181110100303_create_childtable_meta_groups.js

...10100404_create_associativetable_metagroup_memberships.js

db/migrations_v2/20181110110101_create_messages.js

...ions_v2/20181110110202_create_childtable_announcements.js

db/migrations_v2/20181110110303_create_childtable_events.js

...ions_v2/20181110110404_create_childtable_private_posts.js

...grations_v2/20181110110505_create_childtable_questions.js

db/migrations_v2/20181110110606_create_childtable_answers.js

db/migrations_v2/20181110120101_create_requests.js

...ns_v2/20181110120202_create_childtable_user_join_group.js

.../20181110120303_create_childtable_group_join_metagroup.js

.../20181110120404_create_childtable_group_coauthor_event.js

db/migrations_v2/readme.txt

db/migrations_v3/20181110191614_create_groups.js