Send welcome email to gift code subscribers

Fixes #204
fix test flicker on name encoding
Merge branch 'refs/heads/master' into gift-code-signup-email

Conflicts:
	app/controllers/subscriptions_controller.rb
	features/step_definitions/gift_code_steps.rb
Merge branch 'refs/heads/master' into gift-code-signup-email

Conflicts:
	app/views/notifications/welcome.html.erb
Merge pull request #209 from seedpod/gift-code-signup-email

Gift code signup email