Fixes github issue #16. config file name no longer hardcoded

Fixes #16.

Now you can choo choo choose your config filename.

![choose1](https://f.cloud.github.com/assets/55951/1527507/b5ac1f66-4bf6-11e3-8708-35bf41f09e7c.jpg)


please merge https://github.com/basho/riak/pull/435 and https://github.com/basho/riak_ee/pull/192 first