Implementation now correctly looks up the Spring XML 'osgi' namespace.
The 'osgi' namespace makes it easy to export a bean as an OSGi service.
The extender now always creates a DynamicExtensionsApplicationContext.
Control Panel no longer exports its ApplicationContext as an OSGi service.
Added 'OsgiService' annotation for making beans available as OSGi services.
This annotation is  simple alternative to using <osgi:service> in Spring XML config.