Add data bindings to puppet::storeconfig::puppetdb

  Previously the puppet::storeconfig::puppetdb class didn't adhere to
  the data bindings pattern.
Sync up with changes in the unicorn module.

  Currently the puppet::dashboard class with throw a bad parameter error
  on unicorn::app resources since the upstream module has been changed.

  This commit fixes this issue but getting parameters in sync.
Merge pull request #15 from ody/data_bindings

Add data bindings to puppet::storeconfig::puppetdb
Merge pull request #14 from ody/dashboard_unicorn_params

Sync up with changes in the unicorn module.