Rename pagination parameter to page_number
Merge pull request #498 from moneyadviceservice/rename-page-parameter

Rename pagination parameter 'page' to 'page_number'
Format core autoloading syntax
Remove deprecation warnings from interactor specs
Merge branch 'remove-deprecation-warnings'
Add controller, routes and HTML/JS views for newsletter subscription
[WIP] Newsletter sign up
Add newsletter subscription entity.
Add newsletter subscription decorator.
Add newsletter subscriptions repository.
Add newsletter subscriber as an interactor.
Add newsletter subscriptions controller and route.
Use rails helpers to render localised newsletter subscription form.
Style newsletter subscription form.
Add border separator

I will match the height of this once we alter the content in the other
columns within this row
Add authenticity token to newsletter sign up form.
Define connection post method to handle HTTP 422 status response.
Display localised success and error messages on signup subscription.
Add newsletter signup feature, steps and page object.
Update bubble with new design