Simplify a bit; we can't get this exception as it'll already have fired
for the predicate.
Add a test for the default behavior of load_json.
Bring predicate.py coverage up to 100%.
Get rid of unnecessary conditional.
Test for non-json POST and body_obj.
A test where verify_identity returns False.
Add a few no coverage pragmas for NotImplementedError. Coverage of
Morepath is now at 100% again.
Clarify the behavior of request.after, and actually make it have this
behavior under all circumstances.
ANY doesn't exist anymore in the API.
Document overlapping paths conflict. Fixes #246.