fgm/php__symfony__book: FGM's version of the code suggested in the SF4 book. @ b7e8aabb9f375c85d943dbc9630f9ee52c123698

Frederic G. MARAND b7e8aabb9f Ch. 4: Using session data and flash messages. Extending layouts.		7 lat temu
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lucky	b7e8aabb9f Ch. 4: Using session data and flash messages. Extending layouts.	7 lat temu
base.html.twig	b7e8aabb9f Ch. 4: Using session data and flash messages. Extending layouts.	7 lat temu