Use psr-0 instead of psr0

src/Composer/Autoload/AutoloadGenerator.php

@@ -49,8 +49,8 @@ $loader = new UniversalClassLoader();
 
 EOF;
 
-        if (isset($autoloads['psr0'])) {
+        if (isset($autoloads['psr-0'])) {
-            foreach ($autoloads['psr0'] as $def) {
+            foreach ($autoloads['psr-0'] as $def) {
                 foreach ($def['mapping'] as $namespace => $path) {
                     $exportedNamespace = var_export($namespace, true);
                     $exportedPath = var_export(($def['path'] ? '/'.$def['path'] : '').'/'.$path, true);

src/Composer/Package/PackageInterface.php

@@ -221,7 +221,7 @@ interface PackageInterface
      *
      * {"<type>": {"<namespace": "<directory>"}}
      *
-     * Type is either "psr0" or "pear". Namespaces are mapped to directories
+     * Type is either "psr-0" or "pear". Namespaces are mapped to directories
      * for autoloading using the type specified.
      *
      * @return array Mapping of autoloading rules