add .editorconfig and .ruby-version
Update gems
Setup RSpec 3
Binstub rspec for spring
Use listen strategy for spring

See more on https://github.com/rails/spring#watching-files-and-directories
Setup spring only for development
Add User model
Use right config file for spring
WIP: Persisted user is able to sign in
Refactor specs and SessionController
Add sign_in helper for specs
Take care about configs
Remove long comments in spec helper files
Add authentication helpers
Fix redirect loop
Merge pull request #4 from datarockets/users

Users
Try to fix heroku deployment issue with app_config.yml existence
try to merge v2