Oauthlib

++++++++++++++++++++++++

- Instagram compliance fix
- Added ``force_querystring`` argument to fetch_token() method on OAuth2Session

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- This project now depends on OAuthlib 3.0.0 and above. It does **not** support
versions of OAuthlib before 3.0.0.
- Updated oauth2 tests to use 'sess' for an OAuth2Session instance instead of `auth`
because OAuth2Session objects and methods acceept an `auth` paramether which is
typically an instance of `requests.auth.HTTPBasicAuth`
- `OAuth2Session.fetch_token` previously tried to guess how and where to provide
"client" and "user" credentials incorrectly. This was incompatible with some
OAuth servers and incompatible with breaking changes in oauthlib that seek to
correctly provide the `client_id`. The older implementation also did not raise
the correct exceptions when username and password are not present on Legacy
clients.
- Avoid automatic netrc authentication for OAuth2Session.

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* (Fix) Query strings should be able to include colons.
* (Fix) Cast body to a string to ensure that we can perform a regex substitution on it.

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* (Enhancement) Better sanitisation of Request objects __repr__.

+++++++++++++++++++++++

- Adjusted version specifier for ``oauthlib`` dependency: this project is
not yet compatible with ``oauthlib`` 3.0.0.
- Dropped dependency on ``nose``.
- Minor changes to clean up the code and make it more readable/maintainable.

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* (Fix) Changed the documented return type of the invalidate_request_token() method from the RSA key to None since nobody is using the return type.
* (Enhancement) Added a validator log that will store what the endpoint has computed for debugging and logging purposes (OAuth 1 only for now).