ec2 problems and solutions

ip address / storage / benchmark.

Some context - http://riak-users.197444.n3.nabble.com/Riak-and-host-names-td4026457.html

The diff is messed up for some reason. I've added the following sections. They check out ok on middleman.

## Dealing with IP addresses
## Choice of storage

... and these lines under benchmark.

> Besides running basho bench it is also advisable to load test Riak with your 
> own tests to ensure that load imparted by M/R queries, linking, link-walking,
> full-text queries, index queries are within the expected range.