Added named.conf.local and named.conf options files
Fixed: Admin must be able to add custom data in bind9 configuration files
Fixed: Entire config/zones must not be reloaded when adding new DNS zone/entries (Bind)
Fixed: DNS zones must be added in named.conf.local instead of named.conf
Fixed: DNS server must answer to queries only for zones for which it's authoritative (excepted for localhost)
Fixed: Permissions as set by Debian must be keep (bind9)
Fixed: DNS zone files must be checked and cleaned before installation in production directory
Fixed: DNS server must be protected against common attacks
Fixed: Slave DNS zones should be put in dedicated directory
Refactoring + small fixes + doc