Tumblr API in PHP File structure

I'm trying to use the Tumblr API (PHP) and I cant seem to get all the required files to load correctly.

The Tumblr API can be found here: https://github.com/tumblr/tumblr.php

First thing I found out is that it doesnt include OAuth, so after some searching I found the files on github and uploaded them to my server.

Now it's saying it needs Guzzle. OK, got that uploaded now, but I cant seem to get all the Guzzle files to load up... Example error message:

Interface 'Guzzle\Common\HasDispatcherInterface' not found in /TumblrTest/Guzzle/Common/AbstractHasDispatcher.php

There's a HasDispatcherInterface.php file in that path...

Do the files need to be in a special order? I tried putting all .php files into a folder, and then using require_once I searched for all *.php files in that folder, but that didnt work...

Sorry for a super noob question, any help would be greatly appriciated! Let me know if there's any other info i need to give to help answer this question!

-D

UPDATE: I still have no idea how the above works, but I found a way around it... I actually think it might be easier then figuring the above out!! The following PHP code does what i need it to do, which is grab the posts of the provided user:

$apikey = **[insert api key here]**;
$limit = $_POST['limit'];
$user = $_POST['user'];
$tumblr=$user . ".tumblr.com";
$apidata = json_decode(file_get_contents("http://api.tumblr.com/v2/blog/$tumblr/posts/photo?api_key=$apikey&limit=$limit"));
$mypostsdata = $apidata->response->posts;
$myposts = array();
$j = 0;
foreach($mypostsdata as $postdata) {
    $post["photo_url"] = $postdata->photos[0]->original_size->url;
    $post["width"] = $postdata->photos[0]->original_size->width;
    $post["height"] = $postdata->photos[0]->original_size->height;
    $myposts[$j] = $post;
    $j++;
}
echo json_encode($myposts);

For some reason I cant get it to pull a list of people i'm following and then get their posts, but oh well...