Avoid rebuilding perfdev dir on each run
Avoid rebuilding perfdev dir on each run

yangchengjian/riak,biddyweb/riak,glickbot/riak,DavidAlphaFox/riak,basho/riak,authbox-lib/riak,GabrielNicolasAvellaneda/riak,elkingtonmcb/riak,amyvmiwei/riak,laurenrother/riak