Update Writer page, now use lazy loading to load articles
Add Cache, add a storeprocedure, add a alternate local db
Change all but account manager to store procedures; start focusing on saving content
add auto-save and save to cache; todo: add timer to node.js server side and every 5 minutes update article to database, add html column to database, add store procedure to update article and article_version table
fix some bugs, and save html preview into server side
refactor notebook-manager and cache-manager, to make cache-manager the upper layer; fix some bugs in article reading page
fix more bugs
Add auto-saving to database, fix bug in memory cache
fix article page, add sql files
fix preview bug
fix writer page bug by adding callback
Add purely writing page
fix bugs in sql, add one error catch in account-manager