Setup testing

Sets up:
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+
+group :development, :test do
+ gem 'pry-rails'
+ gem 'byebug'
+ gem 'web-console', '~> 2.0'
+ gem 'spring'
+ gem 'rspec-rails'
+end
+
+group :development do
+end
+
+group :test do
+ gem 'capybara'
+ gem 'selenium-webdriver'
+ gem 'capybara-webkit'
+ gem 'capybara-screenshot'
+ gem 'factory_girl_rails'
+ gem 'database_cleaner'
+ gem 'shoulda-matchers'