First commit for weLaika fork

Main changes:
* Add slim-rails gem and converted basic views to Slim
* Remove application.js in favour of application.js.coffee
* Remove jQuery UI
* Added basic_presenter
* Added unit_spec_helper.rb and model_spec_helper.rb for faster TDD
  cycles
* No SCSS, use SASS
* Added spec/features and spec/presenters directories
* Remove high_voltage and sham_rack gems