Allow offline version of bootstrap/jQuery js/css. Switchable with a boolean in main.html
mixit13 page corrected + some test data added
mixit12 page corrected (especially sessions filter)+ some test data added
fixed design issues raised by clacote.
offline CSS/JS mode improved
offline CSS/JS mode improved (removed offline display in footer)
Merge pull request #92 from mpetitdant/fix/7-sessions-list

Fix/7 sessions list