Merge branch '214-core' into 229-profile-json

Makefile

README.md

bin/grep

bin/lint

docs/communities.md

hive/cli.py

hive/community/__init__.py

hive/community/roles.py

hive/conf.py

hive/db/adapter.py

hive/db/db_state.py

hive/db/schema.py

hive/indexer/accounts.py

hive/indexer/blocks.py

hive/indexer/cached_post.py

hive/indexer/community.py

hive/indexer/custom_op.py

hive/indexer/follow.py

hive/indexer/jobs.py

hive/indexer/notify.py