Awscli-saml-sso

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* Add the ability to run with headless browser and input information in CLI
* Headless is designed for Microsoft AD login pages. Browser can still be used with ``--use-browser``
* Ask for a nickname for each identity provider
* Store information in ``~/.awscli_saml_sso_credentials`` and passwords in python Keyring
* Support only Microsoft Edge browser for maximum compatibility, creating a dedicated persistent profile in ``~/.awscli_saml_sso_credentials`` for each identity provider
* Detect first use, open help page with animated gif, and adapt behavior accordingly
* Bump Selenium and Selenium wire versions

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* Configure default log level to WARN in order to get printed text in terminal uncluttered by logs
* Add a ``--log-level`` option and corresponding ``ASS_LOG_LEVEL`` environment variable to override default log level

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* Detect automatically Chrome or Firefox browser install on user operating system to rely on
* Retrieve SAML response from HTTP request body instead of parsing HTML page
* Fix authentication exception raised when no role was attached to the authenticated account
* Fix authentication that remain stuck when user was associated with only one AWS role

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* Fix github homepage from setuptools configuration
* Add a --version option to display current version from command line

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* Authenticate through SAML identity provider in web browser
* Select among retrieved AWS roles you are allowed to assume
* Store temporary credentials in aws configuration files