Added Gemfile & test_helper.rb

Gemfile:
	added useful production gems (bootstrap, puma)
	development gems (profiling, static analysis, better_error, capistrano for deployment)
	test gems (minitest spec with rails, minitest reporters, capybara + minitest spec, capybara webkit [test js integration], simplecov code coverage, coveralls)

test_helper.rb:
	Basic test_helper setup for minitest spec, minitest reporters, capybara (RackTest + js test via webkit), simplecov / coveralls