First streams implementation

Here a first implementation to compress file from stream resource 

```php
<?php

use Alchemy\Zippy\Zippy;

$zippy = Zippy::load();

$archive = $zippy->create('test.zip');

$archive->addStreamMembers(array(
    '/a/custom/location/image.jpg' => 'http://static.url/image.jpg', // Define as key a custom member location 
    'http://static.url/image.jpg', // Default location is the basename
));

```

```
unzip -l test.zip

//output

  Length      Date    Time    Name
---------  ---------- -----   ----
      677  2013-01-24 12:27   a/custom/location/image.jpg
      341  2013-01-24 15:35   image.jpg
---------                     -------
     1018                     2 files

```