2.0.0-alpha

1. Images in articles are zoomable now!
2. A new way to custom pages, (including 404 page), and title is not required to keep same with the filename.
3. Reduce the number of generated html files (A script is implemented to redirect 404 requests on hexo server).
4. Reduce the size of static files (Another tiny time format package is used).
5. Update docs.