Add a README file
Fix typo in the README
Add an introduction text at the top of the index page and prepare place for the graph
Include the SVG file and link to it
Implement saving, loading and visualizing the evolution
Add the evolution file containing the weekly information in json
Add svg graph of the evolution
Little clean up
Improve python script

- Handle case where the data returned is 0
- Save time by generating the svg from data in memory rather than re-reading
the `evolution.txt` file that was just written.
Update evolution infos
Update posts and add the information since the beginning of 2013
Add requirement on pygal
Fix labels on the SVG graph
New SVG with the correct labels
Embed the svg via the embed tag
Anti-date past posts
Anti-date past posts in the script
Add top contributors per topic
Add mechanism to get the top contributors per topic
Update evolution and svg - although they should be the same