name_registry.vif

registry: IFL(address[bytes[100]],this)
@public
@IFL_this
def register(name:IFL(bytes[100],this),owner:IFL(address,this)):
    assert self.registry[name] == 0x0000000000000000000000000000000000000000  # check name has not been set yet.
    self.registry[name] = owner

@public
@constant
@IFL_this
def lookup(name:IFL(bytes[100],this)) -> address:
    return self.registry[name]