DateTime::createFromFormat not handling Timezone

When creating a DateTime with createFromFormat it ignores the timezone specified within the format.

``` php
date_default_timezone_set('UTC');
$time = DateTime::createFromFormat('Y-m-d\TH:i:s.uP', '2015-03-22T11:42:25.943Z');
var_dump($time->getTimezone()->getName());

$time = DateTime::createFromFormat('Y-m-d\TH:i:s.uP', '2015-03-22T11:42:25.943+02:00');
var_dump($time->getTimezone()->getName());
```

**PHP 5.5**

```
Runtime: PHP 5.5.9-1ubuntu4.9 with Xdebug 2.2.3:

string(1) "Z"
string(6) "+02:00"
```

**HHVM**

```
Runtime: HHVM 3.9.1

string(3) "UTC"
string(3) "UTC"
```