Upgrade dependencies
Upgrade dependencies
Fix pictures in home page

Bootstrap includes a carousel builtin. It requires a little bit more
markup but I find it easier and it needs no custom js... The changes
fix most css issues we were having and scale perfectly to different
screen sizes. We also reduce dependencies and remove 3rd party js
plugins from the code base.

I took the chance to display captions with the pictures.
Allow screens a bit smaller
Add spread the word email in French