promoted inline comment to trace logging
adds trace logging
Places required authentication method in flow scope
Attempts to render in basic login JSP, but this mysteriously does not work.
trivial: style: end file with newline
Fixed the issue with the login JSP not recognizing the required authentication method parameter.
Added more Javadoc
Fixed an issue where the remembered authentication was incorrectly calculated off the authentication chain, such that authn_method attribute would then not be available.
Merge pull request #12 from Unicon/authn_method-in-login-jsp

expose requiredAuthenticationMethod in login JSP, correct bug selecting prior Authentication