Move to Symfony Flex

The structure changed completely.
Bundles are gone. Everything is flatten in the folder `src`.
I separated import & api controllers to avoid _pollution_ in the main controller folder.

migrations/Version20161128131503.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace DoctrineMigrations;
+
+use App\Doctrine\WallabagMigration;
+use Doctrine\DBAL\Schema\Schema;
+
+/**
+ * Removed locked, credentials_expire_at and expires_at.
+ */
+class Version20161128131503 extends WallabagMigration
+{
+    private $fields = [
+        'locked' => 'smallint',
+        'credentials_expire_at' => 'datetime',
+        'expires_at' => 'datetime',
+    ];
+
+    public function up(Schema $schema): void
+    {
+        $userTable = $schema->getTable($this->getTable('user'));
+
+        foreach ($this->fields as $field => $type) {
+            $this->skipIf(!$userTable->hasColumn($field), 'It seems that you already played this migration.');
+            $userTable->dropColumn($field);
+        }
+    }
+
+    public function down(Schema $schema): void
+    {
+        $userTable = $schema->getTable($this->getTable('user'));
+
+        foreach ($this->fields as $field => $type) {
+            $this->skipIf($userTable->hasColumn($field), 'It seems that you already played this migration.');
+            $userTable->addColumn($field, $type, ['notnull' => false]);
+        }
+    }
+}