Service on boot

Hi Merritt,

This PR fixes: https://github.com/mkrakowitzer/puppet-stash/issues/10 -- service not starting on boot.

You were just missing an 'enable' parameter and the 'provider' setting prevented the init script links being created.  I'm curious as to what the intention was specifying the provider - was there a specifc problem you were having?

Cheers,
Geoff