added missing interfaces

src/Composer/Downloader/DownloaderInterface.php

@@ -15,21 +15,9 @@ namespace Composer\Downloader;
 use Composer\Package\PackageInterface;
 
 /**
- * Package Downloader
- * 
- * @author Kirill chEbba Chebunin <iam@chebba.org>
- */ 
-interface DownloaderInterface 
+ * @author Konstantin Kudryashov <ever.zet@gmail.com>
+ */
+interface DownloaderInterface
 {
-    /**
-     * Download package
-     *
-     * @param PackageInterface $package Downloaded package
-     * @param string           $path Download to
-     * @param string           $url Download from
-     * @param string|null      $checksum Package checksum
-     *
-     * @throws \UnexpectedValueException
-     */
     function download(PackageInterface $package, $path, $url, $checksum = null);
 }

src/Composer/Downloader/GitDownloader.php

@@ -42,4 +42,4 @@ class GitDownloader implements DownloaderInterface
             system('git archive --format=tar --prefix='.escapeshellarg($package->getName()).' --remote='.escapeshellarg($url).' master | tar -xf -');
         }
     }
-}
+}

src/Composer/Downloader/PearDownloader.php

@@ -66,4 +66,4 @@ class PearDownloader implements DownloaderInterface
         }
         chdir($cwd);
     }
-}
+}

src/Composer/Downloader/ZipDownloader.php

@@ -73,4 +73,4 @@ class ZipDownloader implements DownloaderInterface
             throw new \UnexpectedValueException($zipName.' is not a valid zip archive, got error code '.$retval);
         }
     }
-}
+}