Added NewService to allow custom tls.Config

For example, you may want to load the certificate yourself, or to turn
off verification of SSL certificates to allow a TCP proxy to intercept
the connection for debugging.

apns.go

@@ -54,6 +54,10 @@ type ApnsService struct {
 	conf *tls.Config
 }
 
+func NewService(host string, conf *tls.Config) *ApnsService {
+	return &ApnsService{host: host, conf: conf}
+}
+
 func (service *ApnsService) Connect() (err error) {
 	if service.conn != nil {
 		err = service.conn.Close()

apns_test.go

@@ -2,11 +2,21 @@ package apns
 
 import (
 	"bytes"
+	"crypto/tls"
 	"errors"
 	"testing"
 	"time"
 )
 
+func ExampleNewService(t *testing.T) {
+	config := new(tls.Config)
+	// Load certificate from the filesystem
+	cert, _ := tls.LoadX509KeyPair("cert.pem", "cert.private.pem")
+	config.Certificates = append(config.Certificates, cert)
+	service := NewService("gateway.sandbox.push.apple.com:2195", config)
+	service.Connect()
+}
+
 func BenchmarkNotificationSend(b *testing.B) {
 	queue := NewQueue()
 	for i := 0; i < b.N; i++ {