Merge pull request #683 from ktomk/patch-4

Minor fixes while running along.

src/Composer/Factory.php

@@ -27,6 +27,9 @@ use Composer\Util\RemoteFilesystem;
  */
 class Factory
 {
+    /**
+     * @return Config
+     */
     public static function createConfig()
     {
         // load main Composer configuration

src/Composer/Package/PackageInterface.php

@@ -288,7 +288,7 @@ interface PackageInterface
     /**
      * Returns the release date of the package
      *
-     * @return DateTime
+     * @return \DateTime
      */
     function getReleaseDate();