feat: .bash_profile for 'www' user, T3APP_VHOST_NAMES added to /etc/hosts

With this change provided T3APP_VHOST_NAMES will be added to container's /etc/hosts so e.g. Behat tests or browser-sync proxy can work inside correctly.
Also, there's .bash_profile for 'www' user which configures /etc/hosts too in case the entries are not there yet. This is very useful if you use "side" linked ssh container and user 'www' logs into it. The user might want to e.g. run behat tests which might require configured hosts on that container too.