FilesystemMap::set() should expects FilesystemInterface instead of Fi…

…lesystem

Fix: #575

src/Gaufrette/FilesystemMap.php

@@ -26,12 +26,12 @@ public function all()
  * Register the given filesystem for the specified domain.
  *
  * @param string $domain
- * @param Filesystem $filesystem
+ * @param FilesystemInterface $filesystem
  *
- * @throws InvalidArgumentException when the specified domain contains
+ * @throws \InvalidArgumentException when the specified domain contains
  * forbidden characters
  */
- public function set($domain, Filesystem $filesystem)
+ public function set($domain, FilesystemInterface $filesystem)
  {
  if (!preg_match('/^[-_a-zA-Z0-9]+$/', $domain)) {
  throw new \InvalidArgumentException(sprintf(
@@ -61,9 +61,9 @@ public function has($domain)
  *
  * @param string $domain
  *
- * @return Filesystem
+ * @return FilesystemInterface
  *
- * @throw InvalidArgumentException when there is no filesystem registered
+ * @throw \InvalidArgumentException when there is no filesystem registered
  * for the specified domain
  */
  public function get($domain)