[BISERVER-8039] Adding the ability to query the system for all implemetations of a given type.

Ad-hoc property expression on Spring beans, priority ordering of beans.

Ability to query through Spring and PentahoSystem.

Plugin's spring files now integrated with the main Spring context, can reference from contribute to the main app context
Merge pull request #263 from pentaho-nbaker/objectFactory

[BISERVER-8039] Adding the ability to query the system for all implemeta...