Fixed storing and loading null-values in Redis
Booleans are now stored as 0 or 1 in Redis
Fixed condition building for booleans
finished fix for redis null and boolean value storage

fixes #1311
removed null value adjustment in redis ActiveQuery

asArray will not include null valued keys
optimized redis AR insert
Merge pull request #4944 from yiisoft/redis-fixes

Fixed storing and loading nulls and booleans in Redis