This filter verifies the authentication context received from the IdP
against a list of allowed values.

Thanks to Gyula Szabó for creating this filter!

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@3031 44740490-163a-0410-bde0-09ae8108e29a

Thanks to Thijs Kinkhorst for fixing this!

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- Fix the entityID in the example URL to be a valid entityID.
- Clarify the difference between `TARGET` in authentication response
  vs. `target` in authentication "request".

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@2884 44740490-163a-0410-bde0-09ae8108e29a

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@2881 44740490-163a-0410-bde0-09ae8108e29a

In some cases, we may receive duplicate responses when the user uses
the back-button in the browser to go back to the HTTP-POST page. This
patch changes the behaviour to just redirect the user to the correct
page, instead of displaying a confusing error message.

Fixes issue 404.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@2873 44740490-163a-0410-bde0-09ae8108e29a

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Thanks to Dyonisius Visser for implementing this!

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Thanks to Gyula Szabó for providing this patch.

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