Base environment

- [x] HAML
- [x] Pry
- [x] Guard
- [x] RSpec
- [x] Capybara
- [x] FactoryGirl
- [x] Forgery
- [x] DatabaseRewinder
- [x] SimpleCov / RCov
- [x] Travis / Coveralls
- [x] Paginate (Kaminari)