lazy initialize redis_objects class ivar for counters
make hash_key class method useable through inheritance
make lock class method useable through inheritance
make value class method useable through inheritance
make list class method useable through inheritance
make set class method useable through inheritance
make sorted set class method useable through inheritance
safter testing of inheritable class methods with anonymous classes
Merge pull request #81 from rossta/lazy_initialize_redis_objects_ivar

Lazy initialize redis_objects class ivar to enable proper inheritance