change admins_controller to authentication_controller
avoid bill validations when uploading the receipt
cucumber for upload receipt failure path
Merge branch 'master' into bs-cucumber-for-failure-paths

Conflicts:
	features/step_definitions/internationalization_steps.rb
	features/step_definitions/upload_receipt_steps.rb
organize receipts in more restful way
move receipts controller specs to its own file
render errors page for receipt upload
fix receipts controller spec
Merge branch 'master' of https://github.com/thoughtworks/billbo

Conflicts:
	features/step_definitions/internationalization_steps.rb
	features/step_definitions/upload_receipt_steps.rb
Merge branch 'master' into bs-cucumber-for-failure-paths

Conflicts:
	features/step_definitions/internationalization_steps.rb