add spec of md5_* functions for R15B0x
add spec of md5_* functions for R15B0x

laurenrother/riak_cs,sdebnath/riak_cs,basho/riak_cs,dragonfax/riak_cs,GabrielNicolasAvellaneda/riak_cs,sdebnath/riak_cs,GabrielNicolasAvellaneda/riak_cs,dragonfax/riak_cs,yangchengjian/riak_cs,yangchengjian/riak_cs,basho/riak_cs,yangchengjian/riak_cs,GabrielNicolasAvellaneda/riak_cs,basho/riak_cs,dragonfax/riak_cs,sdebnath/riak_cs,yangchengjian/riak_cs,GabrielNicolasAvellaneda/riak_cs,basho/riak_cs,dragonfax/riak_cs,laurenrother/riak_cs,laurenrother/riak_cs,sdebnath/riak_cs,laurenrother/riak_cs