logout_response: Don't convert response to string

lxml fails when parsing an XML string with an encoding declaration
when the string is encoded in UTF-8 [0]. This should fix it by keeping
the output of decode_base64_and_inflate a bytestring instead of
converting it to a UTF-8 string.

[0] <SAML-Toolkits#60>

logout_response: Don't convert response to string

lxml fails when parsing an XML string with an encoding declaration
when the string is encoded in UTF-8 [0]. This should fix it by keeping
the output of decode_base64_and_inflate a bytestring instead of
converting it to a UTF-8 string.

[0] <SAML-Toolkits#60>

Release 1.4.1

Release 1.4.0

Release 1.3.0

Fix pyflakes

Release 1.2.5

Publish KeyDescriptor[use=encryption] only when required

Release 1.2.3

Release 1.2.2