Adding a default environment

- set through puppet.conf
  - created symbolic link from develop -> production in code/environments
  - changed puppet-g10k script to be generated from a template
  - parameterised g10k into hieradata

site/profiles/templates/puppet/server/puppet.conf.epp

@@ -15,3 +15,5 @@ server = <%= $server %>
 node_terminus = exec
 external_nodes = <%= $external_nodes %>
 autosign = <%= $autosign %>
+default_manifest = <%= $default_manifest %>
+default_environment = <%= $default_environment %>