path fix.

extensions/composer/Installer.php

@@ -85,13 +85,15 @@ class Installer extends LibraryInstaller
 	protected function generateDefaultAlias(PackageInterface $package)
 	{
 		$autoload = $package->getAutoload();
-		if (!empty($autoload['psr-0'])) {
+		if (empty($autoload['psr-0'])) {
+			return false;
+		}
 		$fs = new Filesystem;
 		$vendorDir = $fs->normalizePath($this->vendorDir);
 		foreach ($autoload['psr-0'] as $name => $path) {
 			$name = str_replace('\\', '/', trim($name, '\\'));
 			if (!$fs->isAbsolutePath($path)) {
-					$path = $this->vendorDir . '/' . $path;
+				$path = $this->vendorDir . '/' . $package->getName() . '/' . $path;
 			}
 			$path = $fs->normalizePath($path);
 			if (strpos($path . '/', $vendorDir . '/') === 0) {
@@ -101,8 +103,6 @@ class Installer extends LibraryInstaller
 			}
 		}
 	}
-		return false;
-	}
 
 	protected function removePackage(PackageInterface $package)
 	{