Adjust Rack master page with info about Puppet Server (and some caps changes)
Publish Puppet Server docs on website as part of Puppet reference manual

We'll want more info on the index.html page eventually.

This commit also relies on a URL rewrite behavior that isn't checked into the
production docs server yet. (.markdown -> .html)
Add Puppet Server release notes
Merge branch 'dec2014_puppetserver_docs'