#15 set servers per zone

[Beleggrodion]

A nice feature woul'd be that i can set the name servers for specific zone's ex:

• myzonea.com has ns1.mydns.com ns2.mydns.com
• myzoneb.com has ns1.mydns.com ns1.customera.com
• myzonec.com has ns1.mydns.com ns1.customerb.com