Merge pull request #1 from xiaomengli/master

Photo extension sign in with Google
Merge pull request #2 from xiaomengli/master

support retina，modify sign in page
Merge pull request #3 from xiaomengli/master

extension sign out 与 limbo 同步。fix bug: 每次打开图片顺序不一致
add languages
Merge branch 'master' of https://github.com/wandoulabs/ChromeExtension-Photos