Dummy release

version bump to 0.2.2

performance improvements

modify commands to use byte type instead of string.

SentinelPool and SentinelHashPool cleanup:

- remove check if client is realy a master or slave

Add SentinelHashPool

enhancement: Connections Pools can now shrink

bugfix:  pass encoding correctly to the protocol parser

bugfix, if initial connect failed, mark connection as closed

bugfix: fetch OSError when trying to establish a connection

ddddddddfix doku typo

add ability to run redis commands directy on a connection pool, without directly