Document Quattor 13.9.
Announce the GH repo with the templates.
Improve the release notes
Update the documentation for the Aquilon dependencies
Start documenting for real Aquilon deployments
Update the documentation of Aquilon dependencies.
Document how to get a Quattor instance started
Improve the documentation of Aquilon installs
Add diagram of interprocess data and communication

Based on an old aquilon related diagram provided by @njwilliams.
Update process diagram and add svg source
Update 2012-06-19-documentation-overview.md

Add interprocess flow diagram to overview.
Update the documentation on the upgrade to Yum-SPMA

Mention the new template repositories
Make the code snippets prettier
Fix mismatched quotes
Update the JSON documentation
Print the modified tag when available.

We print it next to the date of the entry, in "muted" style.