Django-social-auth3

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* Convert access_token into a Token instance on OAuth backends

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* Add option to use email address as username. Closes 597
* Updating Google OpenID, OAuth and OAuth2 documentation links.
* remove unnecessary South documentation, fix typos
* Fix rst indention
* Add description of ``SOCIAL_AUTH_FIELDS_STORED_IN_SESSION``
* Use named kwargs to access arguments in user_data. Closes 587
* Added stackoverflow backend
* - Support for custom user model (django 1.5)
* Add saving extra data from POST or GET to session
* Added zip_safe option to setup.py
* Add tests to setup.py
* Update models section with fields lengths settings in south migrations. Refs 579
* Use fields lenght settings in south migrations. Closes 579
* Updated changelog. Closes 580
* Remove repeated v1 in readability path.

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* Check for social_auth.backends.oauth2 before using it. Closes 574
* Merge pull request 577 from Troytft/patch-1
* Update social_auth/urls.py
* Update social_auth/urls.py
* Add migrations to setup.py conf. Refs 410
* South migrations for recent indexes/constraints. Closes 410
* Run slugify only if enabled by setting. Refs 569
* Merge pull request 569 from appel268576/master
* PEP8
* Merge pull request 571 from kjoconnor/readability
* Merge pull request 572 from fmarier/new_browserid_urls
* Update BrowserID/Persona URLs
* Fixing
* Adding comments
* Fixing variable name
* Fixing tokens
* Overriding tokens method ala Twitter
* PEP8/pyflakes fixes
* added slugify to ensure that users from Linkedin / Facebook have clean usernames
* fullname isn't working
* fullname isn't working
* DSA expects it as fullname
* Adding docs
* Adding email_into_address to extra_data
* Adding myself
* Adding to backends index
* Adding to example
* Adding to example
* Updating docs
* Adding to docs
* Merge remote-tracking branch 'upstream/master' into readability
* Missing an argument, fixing extra_data
* Readability also returns email_into_address
* Tweak association and nonce models fields lengths. Refs 539
* Should be an else there
* auth_complete?
* Hrmm
* Merge branch 'master' of git://github.com/omab/django-social-auth into readability
* PEP8
* Fix loop
* Clear docs about pipeline return values
* Add extra arguments to create_user. Closes 565
* Get auth extra arguments from setting too

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* Add management commands to setup.py conf. Closes 564
* Avoid AttributeError on backend_setting call. Closes 561

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* Merge branch 'master' of github.com:omab/django-social-auth

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* Merge pull request 558 from krvss/master
* Merge pull request 559 from theJohnnyBrown/linkedin-docs-example
* add some more info to the linkedin backend docs
* Simple example of authentication using popups.
* Merge pull request 556 from ashchristopher/master
* Merge remote-tracking branch 'upstream/master'
* Added support for constraining authentication to a GitHub organization.