add dsdc_master to the portmap service
add support for threading c++11 options into DSDC builds
abstract all the uses of aclnt away behind a new class, connection_t, which will hopefully be able to allow us to use Redis connections without too many deep changes
upgrade the dsdc_master framework to accept redis slaves
use Lua scripts that run on the Redis server to perform expiration and checksum checks
add sfslite rpc stats to dsdc_master
change dsdc version to something reasonable
fixes for clang 3.6
Merge pull request #2 from okws/MM_redislave

Changes to support Redis slaves