Merge pull request #5 from piojo/master

Promote the JSON migration from review to documentation.
Add an example of how upgrades could be managed with the new SPMA.
Document the upgrade process to the new SPMA.
Continue documenting the mirroring layout
List one additional dependency for the new SPMA on SL5.
Finish the documentation on how to upgrade to the new SPMA
More clarifications for the "server-side" mapping of nodes.
Fix typo.
Move the upgrade to new SPMA to the review part.
Add release notes for Quattor 13.02.
Add the release announcement.
Fix a broken link.
Merge pull request #7 from piojo/update-pkgs

A possible way of mirroring and maintaining packages

Open for review.
Merge pull request #6 from piojo/yum-upgrade

Reviewing the upgrade process to the new SPMA.
Merge pull request #8 from piojo/release-notes

Release notes
Move to review!
Move the document on tracing to documentation
Move the documentation on tracing to a more prominent place
Fix the copyright dates