raise exceptions when walking through object path

if we're given path a.b.c and the existing object is:
a:
  b:
   - item1
raise an exception due to unexpected objects found while traversing the path (ie. b is a list, not a dict)

also, add_entry assumes new dicts for each sub element when creating elements besides the final assignment value.
doing something like a.b.c[0] = 12 where 'c' doesn't exist raises an exception

add test cases to cover:
access path that differs from existing object
create new objects with an embedded list in the path
create new object with a list at the end (define the end list in the passed in 'value' to avoid this exception)

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