Merge pull request #3 from JustSilverman/controllers

Controllers updates
Merge pull request #4 from JustSilverman/controllers

controllers done for the most part
Created seed data and added vote method to post and comment classes
Merge branch 'master' of https://github.com/JustSilverman/hn_clone into models
Modified controllers
Merge pull request #5 from JustSilverman/models

Updated controllers
sessions and login