Merge branch 'mt-new-tests' into 'develop'

hive/db/schema.py

hive/db/sql_scripts/bridge_get_account_posts_by_replies.sql

hive/db/sql_scripts/condenser_follows.sql

hive/db/sql_scripts/condenser_get_by_replies_to_account.sql

hive/db/sql_scripts/db_upgrade.sh

hive/server/bridge_api/methods.py

hive/server/condenser_api/cursor.py

hive/server/condenser_api/methods.py

tests/tests_api