Add a prez via the new form.

Signed-off-by: François de Metz <francois@stormz.me>
Refactor the router to inject the board already fetched.

Signed-off-by: François de Metz <francois@stormz.me>
Update the link in the frontpage to submit a talk.

Signed-off-by: François de Metz <francois@stormz.me>
Merge pull request #60 from parisjs/program/new_form

Programme - nouveau formulaire