Remove key authorities from production aggregate.
Introduce a 2048-bit compromised keys list, and use it to block a key erroneously shipped with the Shibboleth IdP 3.0.0-alpha1 release.
Remove Spring schema version numbers from schemaLocations.

According to documentation, this is now the preferred/best practise.
Simplify configuration using property placeholder replacement.
Rework how system properties are passed into an mda invocation.

This allows new properties to be injected more easily, and allows Ant's property
hierarchy (including external property files) to be used to create new ones or
override old ones.