Added stock location admin request specs
set position for a Variant object on creation

Fixes #2744
Revert use of display_price in data-price attribute for _cart_form

Fixes #2886

Conflicts:
	frontend/app/views/spree/products/_cart_form.html.erb
Identation fix
Display a Name on cart input on payment step

It creates a name column on spree_credit_cards table to insert the data
instead of using the old first_name and last_name fields, fixes #2486
Move payment partial from core to frontend

Plus make it use the name attribute instead of the deprecated first_name
and last_name