Changelog

Add Zeitwerk compatablility by replacing class_eval with Module.prepend where appropriate.
Update test suite + Use Spree Dev Tools for testing.
Configure view files for Spree 4.1 and upwards (Bootstrap 4).
Set Javascript to use Turbolinks for the new storefront.
Add pagination to the reviews index page.
Add view all reviews button to the reviews summery.
Add reviews cancle button to the new review from.

Updated layout and Deface hooks to work with new Spree Bootstrap layout.
Refactor configuration settings so it actually works without boolean hacks.
Renamed preference :render_show_identifier_checkbox to :show_identifier and applied it to settings form so it can be changed from admin.
Moved loose constant NB_STARS into settings, now reached with Spree::Reviews::Config.stars.
Heavy syntax refactor for Rubocop and Hound CI.
It now only support Ruby 2.1.x, same as Spree v3.0.0.beta

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