uninstall.sh: do not remove configuration and students info
Implement the /post API

This API allows the students to retrieve their blog post,
to see its sources, to see the annotations.

The annotations part is not yet implemented, actually.
private.tpl.html += /post/{annotate,read,view-source} links
run.sh: chdir /usr/local/share/rivoluz

This allows us to run rivoluz from the command line and in
foreground for debugging purposes.
Fully implement /post/annotate
Implement /annotate/ URL: the annotator store
Add init_ca.sh script to manage the highgarden CA

Used to generate PCKS#12 certificates that Clara and I can use
to annotate the student's blog posts.
Add rivoluz (the compiled executable) to .gitignore
Give the annotation feature the final touches

1) For https authentication to work, we need to serve the
   /post/annotate/... URL using HTTPS

2) Remember to pull the CA certificate
utils.js: fix the header name used for CORS
Implement the annotation feature