Py3winrm

- Ensure server_cert_validation=ignore supersedes ca_trust_path/env overrides

- Added support for message encryption over HTTP when using NTLM/Kerberos/CredSSP
- Added parameter to disable TLSv1.2 when using CredSSP for Server 2008 support
- Error detail from SOAP fault (if present) is now included with HTTP 500 errors
- Fixed CA path override (incl envvar)
- Fixed Kerberos service override
- Try harder to suppress urllib3 InsecureRequestWarnings on various OSs
- Fixed timeout values to parse correctly if passed as strings
- Various updates to CI/tests

- Added support for CredSSP authenication (via requests-credssp)
- Improved README, see 'Valid transport options' section
- Run unit tests on Linux / Travis CI on Python 2.6-2.7, 3.3-3.6, PyPy2
- Run integration tests on Windows / AppVeyor on Python 2.7, 3.3-3.5
- Drop support for Python 3.0-3.2 due to lack of explicit unicode literal, see pep-0414
- Drop support for Python 2.6 on Windows
- Add support for Python 3.6-dev on Linux

- Minor import bugfix for error "'module' object has no attribute 'util'" when using Kerberos delegation on older Python builds

- Switched core HTTP transport from urllib2 to requests
- Added support for NTLM (via requests_ntlm)
- Added support for kerberos delegation (via requests_kerberos)
- Added support for explicit kerberos principals (in conjuction w/ pykerberos bugfix)
- Timeouts are more configurable

- Force basic auth header to avoid additional HTTP request and reduce latency
- Python 2.7.9+. Allow server cert validation to be ignored using SSLContext.verify_mode
- Tests. Enable Python 3.4 on Travis CI