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[api] Ensure parameters are parsed correctly in VariantsController#create
Change out live() usage (removed in jQuery 1.9)

Fixes #2629
Various small admin styles fixes
Error out when loading sample shipping methods if zones don't exist
Fixes promo Add to cart event name

Also takes the opportunity to reorganize event locales under en.yml,
fixes #2562

Fixes #2599
Fixes backend New Product button for edit page

Backend products edit page has too much content already. While we could
just add:

  <div id="new_product" data-hook></div>

to make the form load on the same page imo it's less confusing to just
open the form for a new product in a new page.

fixes #2531

Fixes #2600
Change meta_description on spree_products from string to text

Fixes #2611