Autoload problem

composer.json

{
  "name": "thl/admin-module",
  "type": "thl-module",
  "description": "The admin module.",
  "keywords": [
    "thl",
    "core"
  ],
  "license": "MIT",
  "authors": [
    {
      "name": "Sunel TR",
      "email": "sunelbe@gmail.com"
    }
  ], 
  "require": {
    "php": ">=5.5",
    "thl/composer-installer": "dev-master"
  },
  "require-dev": {
    "phpunit/phpunit": "~4.0"
  },
  "suggest": {
   
  },
  "autoload-dev": {
    "psr-4": {
      "Modules\\Admin\\": "src/"
    }
  },
  "extra": {
    "branch-alias": {
      "dev-master": "1.0-dev"
    }
  },
  "minimum-stability": "dev",
  "prefer-stable": true
}

ThlInstaller.php

<?php
namespace THL\Installer;

class ThlInstaller extends BaseInstaller
{
    protected $locations = array(
        'module' => 'Modules/{$name}/',
        'theme' => 'Themes/{$name}/'
    );

    /**
     * Format package name.
     *
     * For package type asgard-module, cut off a trailing '-plugin' if present.
     *
     * For package type asgard-theme, cut off a trailing '-theme' if present.
     *
     */
    public function inflectPackageVars($vars)
    {
        if ($vars['type'] === 'thl-module') {
            return $this->inflectPluginVars($vars);
        }

        if ($vars['type'] === 'thl-theme') {
            return $this->inflectThemeVars($vars);
        }

        return $vars;
    }

    protected function inflectPluginVars($vars)
    {
        $vars['name'] = ucfirst(preg_replace('/-module/', '', $vars['name']));

        return $vars;
    }

    protected function inflectThemeVars($vars)
    {
        $vars['name'] = ucfirst(preg_replace('/-theme$/', '', $vars['name']));

        return $vars;
    }
}