Udsoncan

New feature:
- Resolved 37 - Now possible to use ``client.payload_override`` to send arbitrary payloads and still take advantage of the client capacity of analyzing a malformed response. See https://udsoncan.readthedocs.io/en/latest/udsoncan/client.html#overriding-the-output

Bug fix
- 22 : Trying to use a closed connection will trigger the right Exception

Enhancement
- 29 : Now possible to use write_data_by_identifier with multiple values without specifying a custom codec
- 35 : Indentation switched to spaces instead of tabs
- Fixed several typos or erroneous error messages

- Client handles P2 and P2* timeouts.

- Supports python-can through isotp module
- Exclude unit test folder from release

Fix 11

- Put config setup in setup_config()
- Added AsciiCodec
- Throw an exception is did_config is set to an empty string
- Added examples