update debugger to 1.6.6 to support ruby2.1.1
add devise and add warden, omniauth and figaro
add application.yml to .gitignore
remove devise
use github to auth and use warden to login
remove "self." in post model
add factory_girl_rails, guard-rspec and annotate gems
add annotation to post model
use ActiveSupport's parameterize to change title to url
add test for post model
use guard to test automatically