Add tagged services for import

- list services in /import
- add url to import service
- ImportBundle routing are now prefixed by /import
- optimize flush in each import (flushing each 20 contents)
- improve design of each import
- add more tests

src/Wallabag/ImportBundle/WallabagImportBundle.php

@@ -3,7 +3,15 @@
 namespace Wallabag\ImportBundle;
 
 use Symfony\Component\HttpKernel\Bundle\Bundle;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Wallabag\ImportBundle\Import\ImportCompilerPass;
 
 class WallabagImportBundle extends Bundle
 {
+    public function build(ContainerBuilder $container)
+    {
+        parent::build($container);
+
+        $container->addCompilerPass(new ImportCompilerPass());
+    }
 }