Adds support for deploying the visitors example app, backed with Riak
Adds basic support for installing riak 2.0 (does not add support for 2.0-specific features)
This closes #162

* github/pr/162:
  Adds basic support for installing riak 2.0 (does not add support for 2.0-specific features)
  Adds support for deploying the visitors example app, backed with Riak