Support for new 'set' API (redis 2.6.12+)

I have added support for the new "set" command (https://github.com/antirez/redis/blob/unstable/src/t_string.c) that has the following args:
SET key value [NX] [XX] [EX \<seconds\>] [PX \<milliseconds\>]

see further details http://redis.io/commands/set

Tell me if the IntelliJ import formatting changes are annoying/should be avoided.

Thanks !