Merge pull request #1 from scienceoflife/master

hackernews nokogiri scraping
Merge pull request #2 from scienceoflife/master

categorized articles and some scraping
added comments with 3 categories for articles
fixed merge conflicts
add defaults for user categories
lvling system, add scores for comments
fixed the routes
made redirect from / to /renaissance if user is logged in
fixed the routes: direct to site#show and check for auth there
fixed routes yet again
added bootstrap