Merge pull request #21 from mrattner/master

Wrote library functions for getting a user from database, followed, following, and posts
Each view now shows the currently logged in user. Clicking on your username will bring you to your user page.
Made the user page show information about the user.
App.js: created route for the user page. Will accept any /user/username url.
Posts.js: getPostsByUser now takes in a user object instead of a username.
User.js: Created display function. Calls render with the appropriate user object's information.
added post functionality and websockets beginnings
updated documentation and README.md
fixed formatting in README.md