Enable experimental proxy via configuration option 'experimental_proxy'

Change-Id: I3c5532d661327e3be50153d1360f96b524c91f29
diff --git a/lib/Kalamar.pm b/lib/Kalamar.pm
index c9e9374..3f82113 100644
--- a/lib/Kalamar.pm
+++ b/lib/Kalamar.pm
@@ -236,8 +236,10 @@
   $r->get('/contact')->mail_to_chiffre('documentation#contact');
 
   # API proxy route
-  # $r->any('/api/v#apiv' => [apiv => ['1.0']])->to('Proxy#pass');
-  # $r->any('/api/v#apiv/*path' => [apiv => ['1.0']])->to('Proxy#pass');
+  if ($conf->{experimental_proxy}) {
+    $r->any('/api/v#apiv' => [apiv => ['1.0']])->to('Proxy#pass');
+    $r->any('/api/v#apiv/*path' => [apiv => ['1.0']])->to('Proxy#pass');
+  }
 
   # Match route
   # Corpus route