fix riak installation and configuration
Merge pull request #230 from shaon/testing_riak

fix riak installation and configuration
app.config fix for riak 1.4.6
added custom riak-cs port option so that it can be installed on frontend
Merge pull request #234 from shaon/testing_riak

app.config fix for riak 1.4.6
Merge pull request #236 from shaon/testing_s3_riak

added custom riak-cs port option so that it can be installed on frontend