Fix consistency check (#866)

models/fixtures/issue.yml

@@ -8,7 +8,7 @@
   content: content1
   is_closed: false
   is_pull: false
-  num_comments: 1
+  num_comments: 0
   created_unix: 946684800
   updated_unix: 978307200
 

models/fixtures/repository.yml

@@ -4,7 +4,7 @@
   lower_name: repo1
   name: repo1
   is_private: false
-  num_issues: 4
+  num_issues: 2
   num_closed_issues: 1
   num_pulls: 2
   num_closed_pulls: 0