Create directory is not exists

[soullivaneuh]

Actually, if I have this config:

browscap:
    cache_dir:            %kernel.root_dir%/shared/%kernel.environment%/browscap
    lowercase:            true
    do_auto_update:       false

I have this error on update command:

The cache path /[project]/app/shared/dev/browscap is invalid. Are you sure that it exists and that you have permission to access it?

It could be useful to create directory if not exists.

Thanks.