Add explicit instaparse dependency

This fixes a warning introduced by using Clojure 1.7.0, because the
old (previously depended upon) version of instaparse defined a function
called `cat`, and 1.7.0 also defines a `cat`.
Make linters happy
We know they're store props
conn -> client
Actually, client -> conn

Even though Welle docs call it a client, the name for that thing is
consistently "conn".
Basic riak tests against live cluster