Dear Customer,

Your order has been shipped

============================================================
Shipment Summary
============================================================
<% @shipment.line_items.each do |item| %>
  <%= item.variant.sku %> <%= item.variant.product.name %> <%= variant_options(item.variant, :include_style => false) %> (<%= item.quantity %>)
<% end %>
============================================================

<%= "Tracking Information: #{@shipment.tracking}" if @shipment.tracking %>

Thank you for your business.

Dear Customer,

Your order has been shipped

============================================================
Shipment Summary
============================================================
<% @shipment.manifest.each do |item| %>
  <%= item.variant.sku %> <%= item.variant.product.name %> <%= variant_options(item.variant, :include_style => false) %> (<%= item.quantity %>)
<% end %>
============================================================

<%= "Tracking Information: #{@shipment.tracking}" if @shipment.tracking %>

Thank you for your business.

Fix for inaccurate shipment confirmation email.
Fix for inaccurate shipment confirmation email.

Use Shipment#manifest instead of Shipment#line_items in shipment confirmation email for better representation of what was shipped

[Fixes #1867]
