/etc/tuleap[en_US|fr_FR]/tour.json
    => [{
         tour_name: "my-first-tour",
         url:"/plugins/{group_id}/{group_name}/blabla.html
        },
        {
         tour_name: "my-first-tour",
         url:"/plugins/{group_id}/{group_name}/blabla.html
​        }]

/etc/tuleap[en_US|fr_FR]/my-first-tour.json
     => {steps: [...]}
/etc/tuleap[en_US|fr_FR]/another-tour.json
     => {steps: [...]}

1. Parse /etc/tuleap/tour/[en_US|fr_FR]/ folders, and look for tour.json

2. Parse tour.json and validate all available tours (only steps are allowed)

3. For each tours, check if the user has already seen it. If no: append "endAction" (for stats) and load it