* 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
* Refine Order for Web3 compat. & add conversions
Changed some of the fields in the Order class so that it can be passed
to our contracts via Web3.
Added conversion utilities so that an Order can be easily converted to
and from a JSON-compatible dict (specifically by encoding/decoding the
`bytes` fields), to facilitate validation against the JSON schema.
Also modified JSON order schema to accept integers in addition to
stringified integers.
* Fixes for json_schemas
Has-types indicator file, py.typed, was not being included in package.
Schemas were not being properly gathered into package installation.
* Add test/demo of Exchange.getOrderInfo()
* web3 bug workaround
* Fix problem packaging contract artifacts
* Move contract addresses to their own package
* Move contract artifacts to their own package
* Add scripts to install, test & lint all components
* prettierignore files in local python dev env
* Correct missing coverage analysis for sra_client
* CI cache lint: don't save, re-use from test-python
* tag hacks as hacks
* correct merge mistake
* remove local strip_0x() in favor of eth_utils
* remove json schemas from old order_utils location
* correct merge mistake
* doctest json schemas via command-line, not code
