Remove "upvoted template"

This was breaking the website, as the “upvoted” template was defined in
viewPost.html
Simplify comments
Add 'use strict'
Add sidebar and make it pretty
Add user profile icon
Darken sidebar item hover background color
Use icons instead of text where possible
Read HN every 2 minutes (thanks Algolia!)
Actually read HN every 2 minutes
Tweet a hot link every 10 minutes in production
Up the Twitter post interval to 20 minutes
Add a user page
Remove the console.log from the user pub
Update Meteor to 0.8.1
Re-add app cache to get speedy
Revamp sidebar and nav

This also uses session data instead of template data wherever possible,
because it’s SO much faster.
Merge pull request #113 from christianbundy/master

Simplify comments