Finalizing TrustEngine config

[Brent Putman]

On 6/18/14 9:02 PM, Cantor, Scott wrote:
>
> Pending that, if you had time to look at changing the global-system
> definitions to include the usual chain of ExplicitKey and PKIX via
> metadata, that would get us past the alpha.

>From the call:  We'll defer the message handler refactoring until after
the alpha:

https://issues.shibboleth.net/jira/browse/OSJ-84
https://issues.shibboleth.net/jira/browse/OSJ-85

We'll ship the alpha with trust engine chains as Scott describes above. 
But also consider making that not the default in the 3.0 release, and
instead have multiple sets of Spring wiring controlled by properties, as
Scott had already done for the SHA1/SHA2 signing config.