Pyramid-google-login

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* Allow empty value for hosted domain 7
* Use setuptools rather than distutils2 for packaging 8

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* Switched over to github.com
* Setup tests with tox and travis (but only for py27 and pypy)
* Support Python 3.5 (Thanks to bensteady.supply)

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* Add ``request.googleapi_settings`` containing google api specific settings.
It's created at configuration time to fail early when some info is missing.
* Add ``request.googleapi`` created and reified for each request. It
encapsulates google api functionalities.
* Move ``AuthFailed`` to ``pyramid_google_login.exceptions``
* Add event ``AccessTokenExpired`` to be notified by client to refresh
automatically access_token.

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* Fix incorrect authorize url format for multiple scopes

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* ``UserLoggedIn.headers`` permit subscribers to add headers to be returned in
response and set customised auth cookie rather than default email.
* Add a setting for the access_type. Default to ``online``

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* Change internal API to get access to all OAuth2 tokens from view
* Change authorization request for offline credentials (to get a refresh_token)
* Add options to specify the OAuth2 scopes
* Send Pyramid events ``UserLoggedIn`` and ``UserLoggedOut``
* Removed setting ``max_age`` (should be set in AuthTktAuthenticationPolicy)