Re-write web content server

I've re-write the web content server with these features:
* support online ebook management ( edit metadata, delete, download)
* design html with Bootstrap, support mobile devices better
* Upload ebook
* Email push
* i18n support
* REST-ful URL
* still can explore library ( by author/publisher/tag/rating )

And I plan to do ( maybe month later )
- Online reading ( no idea about how to do this )
- better edit mode (pull metadata from internet source ( manual choose only one source )