Messages - 1. Terminology : Change Assertion definition to be more generic
Currently, it is:
A set of Claims about the End-User that are attested to by the OpenID Provider and Resource Servers.
A set of Claims that are attested to by an Issuer.
An Issuer is an Entity who issues an Assertion.
A verifiable identifier of an Issuer. An issuer Identifier is a HTTPS URL with no path component.