Merge pull request #253 from pedroigor/master

[PLINK-379] - HTTP Redirect Binding is not restoring original request when accessing a SP for the first time.
chapter on social login
Merge pull request #254 from anilsaldhana/master

chapter on social login
[PLINK-380] - IDPFilter is not populating roles in assertion when using SAML v1.1.