Revert "patching engine creation to always include winnow json parser"
Revert "patching engine creation to always include winnow json parser"

This reverts commit 1aa01354deda5e2aec68db9ebe405b85b2f9be47.

Context: the above commit was obviously a temporary hack. Here I'm reverting
it prior to re-implementing without the hardcoding.

opendesk/pyramid_basemodel,thruflo/pyramid_basemodel