Fixes for broken tox runs (#2053)

* order_utils.py: git rm package.json

This was used at one time, a long, long time ago, but is no longer used,
and its presence actually causes problems when trying to do, eg
`PKG=@0x/python-contract-wrappers yarn build` from within the
order_utils directory.

* order_utils.py: improve `./setup.py clean`

* python-packages: in tox, test, don't lint

* python-packages: update dev req's to fix tox runs

* contract_wrappers.py: post-publish version bump

python-packages/contract_wrappers/setup.py

@@ -226,7 +226,7 @@ with open("README.md", "r") as file_handle:
 
 setup(
     name="0x-contract-wrappers",
-    version="1.0.0",
+    version="1.0.3",
     description="Python wrappers for 0x smart contracts",
     long_description=README_MD,
     long_description_content_type="text/markdown",