Make puppet reference manual nav snippets more consistent
Make it clear that the puppet 3 release notes are for the whole 3.x.x series

IN THE YEAR 20XX, DR LIGHT CREATED------ etc. etc. #forgreatjustice
Puppet 3.2: Add modulo operator to expressions reference
Update puppet 3 system requirements for 3.2
Add special Puppet pseudo-variables to hiera docs
Mention rgen gem requirement for parser = future
Puppet 3: Add external CA docs

Special thanks to Jeff McCune for writing most of this.
Puppet 3.2: Add experimental language feature docs for iteration etc.

Thanks to Henrik and team for writing this.
Add puppet 3.2 release notes
Add links to reworked puppet-network module
Fix a URL
Merge branch 'puppet320'