Start of migration to Jekyll

Migrated the site to Jekyll with basic blog structure
Fix double footer

Footer was present twice in the generated page
start article

start writing an article about jsTrac, with the add of a 'plugin' for a better excerpt
style blog page
complément post

complément du post sur jsTrac + ajout de photos
Removed excerpt plugin

Removed the plugin, we use the built in excerpt_separator mecanism with <!--more-->
Merge pull request #1 from code-troopers/jekyll-site

Jekyll site