user - user/:username path to homepage
Added route users.js, updated routes/index.js and application.js
Added templates users/homepage.leaf and users/notfound.leaf
Added homepage.css to public/stylesheets
Added methods to models/users.js for getting user information
Added comments to lib/view.js, also added params to the model
Added controllers/users.js which chooses notfound.leaf if the user does not exist, or homepage.leaf if they do. Updated controllers/index.js for users.js
Updated layout.leaf to point to /user/username and not /users/username

 notfound.leaf and homepage.leaf are skeletal.
 Homepage has only basic data model published in data.userInfo