Display sessions and sponsors by event
New menu : "Infos/Mix-IT 2012". Displays talks, speakers, and lightning talks.
Hide menus not yet used
Label for no speaker to be displayed
Fixed SQL migration scripts
Fixed Java version to 1.6 to ensure CloudBees deployment.
Sponsor : call for sponsoring. Refactored page.
Use Member.ticketingRegistered=true before resetting to add "Attendee 2012" badge (even if a badge bug didn't give them a "Attendee badge").

Fixed SQL
Fixed https://trello.com/card/bug-page-http-www-mix-it-fr-mixit12-on-voit-les-sessions-non-validees/4e723ede171d7c0000032cae/277
More test data
Readability
Merge pull request #139 from clacote/older-events-display

Older events display
Merge pull request #140 from clacote/bug-fixes

Bug fixes
Fixed https://trello.com/card/bug-menu-participants-page-les-speakers-transformer-le-texte-en-message-d-attente-en-indiquant-que-nous-contactons-actuellement-nos-prochains-invites/4e723ede171d7c0000032cae/273
Page sponsors 2013 : lien vers l'offre de sponsoring.

Fixed
https://trello.com/card/page-http-www-mix-it-fr-mixit13-sponsors-mettre-
en-telechargement-le-dossier-de-sponsoring/4e723ede171d7c0000032cae/274
Suppression référence au "templates powerpoint speakers".

Fixed
https://trello.com/card/bug-page-kit-supprimer-disponible-prochainement-
template-de-presentation-ppt-odt-pour-les-speakers/4e723ede171d7c0000032
cae/276
Merge pull request #143 from clacote/bug-fixes

Bug fixes