Rauth

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* Added Python 3 support (thanks to everyone who contributed, espcially
sashahart)

* Made service and session objects serializable

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* BUGFIX Fixed upstream CaseInsensitiveDict API changes

* BUGFIX Corrected multiple quoting of oauth_token

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* BUGFIX Corrected adding header to OAuth 2.0 where no access token existed

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* Added an ad hoc check against double signing in OAuth 1.0/a

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* Added ability to pass in key name for get_token methods (excluding raw)

* Added ability to pass in custom decoder for get_token methods (excluding
raw)

* Added better error reporting for get_token methods (excluding raw)

* BUGIFX Corrected assignment of custom signature objects in OAuth 1.0
session objects

* Added custom decoder param for request and access token getters

* Updated test runner to not fail when yanc is missing

* Removed bash requirement from test runner

* Updated documentation to include CHANGELOG

* Updated docstring to correct incorrect documentation

* BUGFIX Corrected improper OAuth 1.0/a handling of entity-methods

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* BUGFIX Added CaseInsensitiveDict to ensure headers are properly updated