Version 2.1.1: Fix to allow app to request that SDK does not call Response.End(). This is necessary when using components based on OWIN, as these components can be prevented from setting or clearing cookies by calling Response.End().
Update sample apps for version 2.1.1.
Version 2.1.1 is backwards compatible with 2.1.0, so no changes are required where an app is already working.  However, best practise has changed and the sample apps have been updated to reflect this.