Merge branch 'hotfix/fix_slug_for_production' into develop

* hotfix/fix_slug_for_production:
  fix routes
Merge branch 'hotfix/add_placeholder_to_slug' into develop

* hotfix/add_placeholder_to_slug:
  add placeholder
add solution state to comment
add admin_comment
fix comments form
Merge branch 'feature/admin_comment' into develop

* feature/admin_comment:
  fix comments form
  add admin_comment
  add solution state to comment
fix comments controller
add admin/numbers_controller
fix web/admin/numbers index view
Merge branch 'feature/admin_numbers' into develop

* feature/admin_numbers:
  fix web/admin/numbers index view
  add admin/numbers_controller
  fix comments controller
Merge branch 'release/0.2.4'

* release/0.2.4:
  fix web/admin/numbers index view
  add admin/numbers_controller
  fix comments controller
  fix comments form
  add admin_comment
  add solution state to comment