Add fe80::1 to list of loopback addresses.

On my Mac, my loopback interface is configured (via `/etc/hosts`, out of the box) to have both a link-local and a node-local loopback address, with the link-local address taking precedence:

```
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
	options=3<RXCSUM,TXCSUM>
	inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1 
	inet 127.0.0.1 netmask 0xff000000 
	inet6 ::1 prefixlen 128 
```

That obviously results in a `REMOTE_ADDR` of "fe80::1" rather than just "::1".

Author: dzuelke

web/app_dev.php

@@ -12,6 +12,7 @@
     || isset($_SERVER['HTTP_X_FORWARDED_FOR'])
     || !in_array(@$_SERVER['REMOTE_ADDR'], array(
         '127.0.0.1',
+        'fe80::1',
         '::1',
     ))
 ) {