I notice on my current build `application:get_key(riak_kv, vsn)` and `init:script_id()` return different values. Is the former maintained by hand in the `riak_kv.app.src`? where does the `init:script_id()` value come from? (I mean, I see it comes from riak.rel / riak.boot in, but how does it get there, e.g. mine says `1.3.0rc2` but `application:get_key` says `1.3.0`)