Add LiipThemeBundle

Re-defined the config / user relation to be OneToOne bidirectionnal.
ConfigType is now a service so I can inject the list of available themes that are also used by LiipThemeBundle

Force sqlite for test
In case of people use a different driver in parameter.yml (yes I do :))

src/Wallabag/CoreBundle/Helper/DetectActiveTheme.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace Wallabag\CoreBundle\Helper;
+
+use Liip\ThemeBundle\Helper\DeviceDetectionInterface;
+use Symfony\Component\Security\Core\SecurityContextInterface;
+use Wallabag\CoreBundle\Entity\User;
+
+class DetectActiveTheme implements DeviceDetectionInterface
+{
+    protected $securityContext;
+
+    public function __construct(SecurityContextInterface $securityContext)
+    {
+        $this->securityContext = $securityContext;
+    }
+
+    public function setUserAgent($userAgent)
+    {
+    }
+
+    /**
+     * This should return the active theme for the logged in user.
+     * No active theme for:
+     *     - anonymous user
+     *     - user without a config (shouldn't happen..)
+     *
+     * @return string
+     */
+    public function getType()
+    {
+        $user = $this->securityContext->getToken()->getUser();
+
+        // anon user don't deserve a theme
+        if (!$user instanceof User) {
+            return false;
+        }
+
+        $config = $user->getConfig();
+
+        if (!$config) {
+            return false;
+        }
+
+        return $config->getTheme();
+    }
+}