Requests with ampersand fail

[dmatora]

Like when creating a plan with name "nice & beautiful plan"
name is empty on request
and request fails with <error field="plan.name" symbol="blank">can't be blank</error>

[drewish]

I've got a fix I'm happy with for this over on #150. Let me know if that change fixes your issue. Here's what I was testing it with locally:

$plan = new Recurly_Plan();
$plan->plan_code = 'nice';
$plan->name = "nice & beautiful plan";
$plan->unit_amount_in_cents->addCurrency('USD', 1000);
$plan->plan_interval_length = 1;
$plan->plan_interval_unit = 'months';
$plan->total_billing_cycles = NULL;
$plan->create();
var_dump($plan->name);