Fixed "Cannot read property 'length' of undefined"
Replaced "http://" with "//" to prevent "This page has insecure content." warning
Merge pull request #16 from ym/master

Fixed "Cannot read property 'length' of undefined" && "This page has insecure content." warning
"Recent Posts" widget
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of github.com:Ferrari/hexo-theme-light
add the outline of article content as twitter card description and filter html tag