firewall_rules.go
func (c *Client) FirewallRule(identifier string) (*FirewallRule, error) {
	rule := new(FirewallRule)
	_, err := c.MakeApiRequest("GET", "/1.0/firewall_rules/"+identifier, nil, rule)
	if err != nil {
		return nil, err
	}
	return rule, err
}
func (c *Client) FirewallRule(identifier string) (*FirewallRule, error) {
	rule := new(FirewallRule)
	_, err := c.MakeApiRequest("GET", "/1.0/firewall_rules/"+identifier, nil, rule)
	if err != nil {
		return nil, err
	}
	return rule, err
}
// FirewallRule retrieves a detailed view of one firewall rule