#130 - Moving comparison_controller files to new rails.
#130 - Migrated tw_studios_gadget.

Migrated the old tw_studios_gadget plugin to new rails engine gadgets.
Look at https://github.com/bsharanya/go_card_activity_gadget.git for migration details.
#130 - Adding the new gadget as a gem.

This gadget depends on validatable, adding that also.
#130 - Fix service usage in Rails.

In Rails 2.3, helpers could access controller methods, and so, services
instantiated in application_controller were used by helpers.

In Rails 4, these are separated. So, helpers cannot access them.
Services module was created for this. It was included from both
controllers and helpers. This means, there are multiple references to
the same service, and are accessed separately from controllers and
helpers.

However, this causes issues during stubbing in RSpec. Especially, with
render_views option. In this case, controller specs render views as
well. So, the services used cannot be stubbed easily (they're called
from controllers sometimes, from helpers sometimes).

So, services are accessed using ServiceCache now, for production. For
specs, there is a way to stub those services (using TestServiceCache).
The ServiceCacheStrategy is used to decide between the two caches. The
new Rails configuration property (java_services_cache) is used by the
ServiceCacheStrategy. It is different in test.rb and production.rb.

In most cases, stub_service is all you need. You don't need to worry
about it.
#130 - Moved comparison controller related views from old rails to new rails
#130 - Fixed comparison_controller and specs for it.

Conflicts:
	server/webapp/WEB-INF/rails.new/config/routes.rb
	server/webapp/WEB-INF/rails.new/spec/controllers/application_controller_spec.rb
#130 - Fixing specs for compare pipelines views.
Merge remote-tracking branch 'main_gocd/master'

Conflicts:
	server/webapp/WEB-INF/rails.new/config/routes.rb
	server/webapp/WEB-INF/rails.new/spec/controllers/application_controller_spec.rb
#130 - Fixing routes & application_controller spec after merge.
Merge pull request #290 from bsharanya/master

#130 - Fixing comparison_controller and adding card_activity_gadget