[extensions-web] (11 commits) ...Merge branch 'deploy'

[Yuri Konotopov <ykonotopov src gnome org>]

Summary of changes:

  57b7f20... extensions: Add screenshot to AJAX details (*)
  3972edd... extensions: Check if the screenshot exists before using it (*)
  9c99b23... Merge branch 'master' into deploy (*)
  8c24ade... wsgi: moved script one level up (*)
  9be6bf6... Remove left margin from the extension's page (*)
  e33ab7b... Revert "Remove left margin from the extension's page" (*)
  fab5e50... ajax: limit extensions items count to 25 (*)
  63ad893... Revert "wsgi: moved script one level up" (*)
  6bea425... auth: use default reset url
  f0604d2... update-check: validate extension version.
  6c1d16c... Merge branch 'deploy'

(*) This commit already existed in another branch; no separate mail sent