New website for Spoon open source project based on jekyll
Change background of the header and version of the release
Change URL of pages and add usage page
Adds Google Analytics in all pages
Removes .sass-cache in the repo, useless directory
Fixes background of the header in mobile mode
Merge branch 'website' of https://github.com/INRIA/spoon into website
Minor changes for the production of the website.

Adds all assets of the old website to update link
in the new website. Updates the about page for
initial contributors and gitignore file to remove
sass caches.
Change content of the about page

Add spiral research group reference, list
of contributors and a special thanks for
original spooners.
Merge pull request #62 from GerardPaligot/website