Oauth2client-master

* Add access token refresh error class that includes HTTP status (310)
* Python3 compatibility fixes for Django (316, 318)
* Fix incremental auth in flask_util (322)
* Fall back to credential refresh on EDEADLK in multistore_file (336)

* Fix bad indent in `tools.run_flow()` (301, bug was
introduced when switching from 2 space indents to 4)

* Fix (more like clarify) `bytes` / `str` handling in crypto
methods. (203, 250, 272)
* Replacing `webapp` with `webapp2` in `oauth2client.appengine` (217)
* Added optional `state` parameter to
`step1_get_authorize_url`. (219 and 222)
* Added `flask_util` module that provides a Flask extension to aid
with using OAuth2 web server flow. This provides the same functionality
as the `appengine.webapp2` OAuth2Decorator, but will work with any Flask
application regardless of hosting environment. (226, 273)
* Track scopes used on credentials objects (230)
* Moving docs to [readthedocs.org][1] (237, 238, 244)
* Removing `old_run` module. Was deprecated July 2, 2013. (285)
* Avoid proxies when querying for GCE metadata (to check if
running on GCE) (114, 293)

[1]: https://readthedocs.org/

* Fix OS X flaky test failure (189).
* Fix broken OpenSSL import (191).
* Remove `util.positional` from wrapped request in `Credentials.authorize()`
(196, 197).
* Changing pinned dependencies to `>=` (200, 204).
* Support client authentication using `Authorization` header (206).
* Clarify environment check in case where GAE imports succeed but GAE services
aren't available (208).

* Better environment detection with Managed VMs.
* Better OpenSSL detection in exotic environments.

* Update the `OpenSSL` check to be less strict about finding `crypto.py` in
the `OpenSSL` directory.
* `tox` updates for new environment handling in `tox`.