v2.8.0

We have a great release candidate for v2.8.0 that support SimpleSign binding, contributed by @yanbilik's team.
This pre-release includes the following changes.

Support SAML response over HTTP-REDIRECT binding
Add Login Request/Response over HTTP-POST SimpleSign binding
Enable clock drifts parameters from IDP setting
Fix NameIDFormat extraction from IDP metadata
Add AttributeStatementTemplate, AttributeTemplate and LoginResponseAdditionalTemplates interfaces
Modify attributeStatementBuilder