Jekyll Editor

A markdown editor for github page. ChangeLog: * Refactor code and optimize performance * Store post list to local storage. * Fix bugs when load post list. * Fix bugs when commit a post. * Date format padded with zero. * Added katex support. Features: * Auto login to github * Get posts from git repository * Editor post meta, update post, create post * A powerful markdown editor github: https://github.com/Simpleyyt/jekyll-editor