Merge branch 'dev'

Merge branch 'dev'

Merge branch 'dev'

Merge branch 'dev'

breaking changes: Open_Graph_meta 設置更改，可配置其它參數

feature: 更新 Facebook sdk 到 v15
improvement: 更新 plugins.yml
Remove: 移除 meta keywords

Merge branch 'dev'

Merge branch 'dev'

fix merge conflict

fix: 修復首頁文章 valine 評論數只顯示第一篇的 bug

fix: 修復子目錄下，第三方插件本地資源無法加載的 bug closed jerryc127#908
fix: 評論系統開啟時 busuanzi 的 page_pv 不顯示的 bug closed jerryc127#902
fix: 修復 pjax 下，使用 mermaid 跳轉會重新加載的 bug

Merge branch 'dev' of https://github.com/jerryc127/hexo-theme-butterfly…

… into dev