Edit 3--7, add comments.

Please also see comments on commit.
-GLOBAL-Consider showing thus-far completed life preserver at each stage
so that you can get context of what has been done so far (rather
than showing discrete sliver)
-GLOBAL-Add intro sentences between main title and title of step:Added
for 3-7, needs to be done for Step 1, Step 2.
-Clarify whether there is a Configuration domain separate from Core
domain and REST domain; language is unclear.
-Step 3, missing JSON response (3 paragraphs above Summary)
-Step 4, why wouldn't you need to test whether orders are recieved re
testing code path that must work
-Step 6, suggest showing final output when you run app and run OrderTests
(at end before Summary)
-Step 6, Summary first sentence garbled
-Recap doesn't mention working on Core domain

@russmiles @royclarkson @daviddawson