Force user-agent for iansommerville.com

When using the default User Agent, the website returns a 403. By forcing the User Agent for this domain, we got the proper behavior: a 200

Since we can't _append_ new user agent to the default graby configuration, we need to rewrite all the default config + the new one.

Fix #1801

src/Wallabag/CoreBundle/Resources/config/services.yml

@@ -39,7 +39,22 @@ services:
     wallabag_core.graby:
         class: Graby\Graby
         arguments:
-            - { error_message: "wallabag can't retrieve contents for this article. Please report this issue to us." }
+            -
+                error_message: "wallabag can't retrieve contents for this article. Please report this issue to us."
+                http_client:
+                    user_agents:
+                        'lifehacker.com': 'PHP/5.2'
+                        'gawker.com': 'PHP/5.2'
+                        'deadspin.com': 'PHP/5.2'
+                        'kotaku.com': 'PHP/5.2'
+                        'jezebel.com': 'PHP/5.2'
+                        'io9.com': 'PHP/5.2'
+                        'jalopnik.com': 'PHP/5.2'
+                        'gizmodo.com': 'PHP/5.2'
+                        '.wikipedia.org': 'Mozilla/5.2'
+                        '.fok.nl': 'Googlebot/2.1'
+                        'getpocket.com': 'PHP/5.2'
+                        'iansommerville.com': 'PHP/5.2'
         calls:
             - [ setLogger, [ "@logger" ] ]
         tags: