Merge pull request #303 from MattKetmo/directory_inception

[BUG] Fix error when moving up a directory content

src/Composer/Downloader/FileDownloader.php

@@ -111,6 +111,13 @@ abstract class FileDownloader implements DownloaderInterface
         $contentDir = glob($path . '/*');
         if (1 === count($contentDir)) {
             $contentDir = $contentDir[0];
+
+            // Rename the content directory to avoid error when moving up
+            // a child folder with the same name
+            $temporaryName = md5(time().rand());
+            rename($contentDir, $temporaryName);
+            $contentDir = $temporaryName;
+
             foreach (array_merge(glob($contentDir . '/.*'), glob($contentDir . '/*')) as $file) {
                 if (trim(basename($file), '.')) {
                     rename($file, $path . '/' . basename($file));