change logs:

Optimize preview link.
Optimize Google Sign-in button to comply Google new requirements.
Add auto-focus in Blog/Question form.
Fix bug: some app not showing in mobile app
Fix bug: SQL error when "load more" in hashtag page.
And some other known bugs.

Upgrade:
upload the following folders:
includes/libs/
files/common_css/
js/common.js
themes/default/home.tpl.php (Google sign-in button changes)