Calculations regarding weight are based on ounces and converted to ounces using :unit_multiplier
No need to also convert the max weight values specified by the carriers. These MUST be represented in ounces given current :unit_multiplier logic.
Merge branch 'max-weight' of github.com:rterbush/spree_active_shipping into max-weight

Conflicts:
	app/models/spree/calculator/shipping/usps/base.rb