WIP: Support commerce physical#5

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MattBred wants to merge 5 commits intoAcroMedia:7.x-1.xfrom

MattBred:support_commerce_physical

Commits on Jan 9, 2018

Issue #2826229 by mbreden: Add support and basic unit tests for weight & dimensions
Matt Breden
committed
Issue #2826229 by mbreden: Rename some variables, add tests and logic to lowercase text, and add some extra error handling
Matt Breden
committed

Commits on Jan 12, 2018

Issue #2826229 by mbreden: Add better error messages for invalid weight/dimensions, and rename some variables to make it more clear what they do
Matt Breden
committed
Issue #2826229 by mbreden: Add a functional test for commerce_physical field handling
Matt Breden
committed
Issue #2826229 by mbreden: Rename variables again because naming things is hard
Matt Breden
committed