Payload as a dict regardless of request content type.
PATCH: item-id wrapper removed from payloads.
PATCH tests updated for simplified payloads.

Some tests outside of TestPatch are still failing since I updated
tests.__init__.py. WIP.
Merge branch 'develop' into simplify
PUT: item-id wrapper removed from payloads.
PUT tests updated for simplified payloads.
POST: item-id wrapper removed from payloads.
POST: tests updated to reflect simplified payloads.
Test suite updated to reflect simplified payloads.
Docs update for 'no item-id payloads'
Merge branch 'develop' into simpler-edits
Merge branch 'develop' into simpler-edits

Conflicts:
	CHANGES
	eve/tests/methods/patch.py
	eve/tests/methods/post.py
New tests updated to match new payloads.

Also, superfluous test removed.
Merge branch 'simpler-edits' into develop. Closes #139.