Composer autoloading issue

composer.json

{
  "name": "bubblefoundry/Request",
  "type": "library",
  "description": "Request is a simple webapp framework that focusing on routing HTTP requests and returing responses.",
  "keywords": ["http", "request", "response", "route"],
  "authors": [{
    "name": "Peter Robinett",
    "email": "peter@bubblefoundry.com",
    "homepage": "http://www.bubblefoundry.com"
  }],
  "version": "0.1.0",
  "repositories": [{
    "type": "vcs",
    "url": "git://github.com/bubblefoundry/BFCollections.git"
  }],
  "require": {
    "php": ">= 5.3.0",
    "bubblefoundry/BFCollections": ">=0.1.0"
  },
  "autoload": {
    "psr-0": {
      "bubblefoundry/Request": "src/"
    }
  }
}

index.php

<?php
namespace bubblefoundry\Request;

// use composer for autoloading all dependencies
require 'vendor/.composer/autoload.php';

// from http://www.php.net/manual/en/class.errorexception.php
function exception_error_handler($errno, $errstr, $errfile, $errline ) {
    throw new \ErrorException($errstr, 0, $errno, $errfile, $errline);
}
set_error_handler(__NAMESPACE__ .'\exception_error_handler');

$url = $_SERVER['REQUEST_URI'];

try {
  // $response = Config::routes($url);
  throw new \Exception("Not implemented yet");
}
catch (\Exception $e) {
  // if match error, convert to 404
  $response = new Response(404, "text/html", "Not found: $url");
}

header($response->status(), true, $response->code);
print $response->body;

?>

notes.md

When I visit index.php I get:

Fatal error: Class 'bubblefoundry\Request\Response' not found in /home/beachhea/public_html/labs/request/index.php on line 23

The Response class is in /home/beachhea/public_html/labs/request/src/Response.php and is in the same namespace, bubblefoundry\Request\. I'm stumped about why it is not getting loaded.