Dev notes for master branch.

[futhr]

After some refactor on master branch I noticed some things that can be improved or need to be fixed:

• Need to look into issue "Cross Sells" not working #82 and add better specs for the calculator so it proper test discounts.
• The delete related record need to be rebuilt, it doesn't work and the JS inject the list after delete totally wrong. This is related to issue Admin related product delete issue #95
• Need to look into issue has_related_products? doesnt work like you should expect #88 concerning has_related_products?
• Need :ru :pl :nl :cs :it check for new active_model translations.

These are dev memory notes, you welcome to help out with PR.