update netty dependency to 3.6.6

fix bug decoding output of aborted transaction

fix buffer reallocation bug affecting Map params

update netty dependency to 2.6.3

celebrate redis 2.6 with a release

fix bug in pubsub protocol decoding

make underlying async connection the public async interface

discard canceled commands on reconnect

add missing SLOWLOG command

make bgsave test wait for bgrewriteaof to finish