Fixed socket.io not loading problem

-socket.io is attached correctly to the express app
-un-commented static javascripts in header.ejs
-added init function in post.js route to initialize socket.io
Installed Node dependencies for database support

-sqlite 3
-async.js for asynchronous database calls
-sequelize for object-relational mapping
Created	Sequelize sqlite database

-defined schema for user, post, and follow
-defined relations between users, posts, and follows
-synced the tables
Added privacy attribute to Post
Merge pull request #46 from mrattner/master

Fixed socket.io script not loading and started database support