Initial setup for posts, votes, and point-tracking WIP
Adds comments, changes rating to points system based on votes & time
Adds polymorphic comments to link WIP
Updates delete and comment functionality to create comment threads
Adds user authentication
Adds user creation and the  capacity to upload links, vote on them, and comment.
Revises logout function for user
Completes login and logout function for user
Limits a user to one vote per link
Adds basic bootstrap styling
Updated styling, bug fix on user vote limit
Limits link, comment, and post activity to users only
Fixes points system testing
Updates README
Fixes responsive style
Updates css for nav bar
merge master