Implements #150

Adds an entry inside moderation section that allows moderators to check
pending tasks and mark them as solved.

spec/factories.rb

@@ -1081,4 +1081,20 @@ LOREM_IPSUM
       comments { Faker::Lorem.sentence(10) }
     end
   end
+
+  factory :administrator_task do
+    source { |s| s.association(:proposal_executed_dashboard_action, :with_comments) }
+    user
+    executed_at { Time.now }
+
+    trait :pending do
+      user { nil }
+      executed_at { nil }
+    end
+
+    trait :done do
+      user
+      executed_at { Time.now }
+    end
+  end
 end