Adding more commands

Support for `HVALS`, `HKEYS` and `LRANGE`.
Autoloading by namespace doesn't force any naming convention. It can be just solved by eg. annotation.

As far as I know Redis is not case sensitive. Moreover classes which you uppercased are only used in source code and it is not connected with case used in command parameter in QueryPparserPlugin. Uppercased names of classes look just strange. What do you think about it?