Define SCAN on redis base.
Implement SCAN for sync redis manager.
Implement SCAN for async redis manager.
Better docs for SCAN.
Consistently use None as the SCAN cursor begin/end sentinel in both parameter and return values.
Simple implementation of SCAN for FakeRedis.
Add more tests for FakeRedis SCAN.
Better FakeRedis.scan() implementation.
Add note mentioning redis version requirement to SCAN docs.
Merge branch 'feature/issue-809-redis-scan' into develop