Added OSGI example for custom dwr servlet instance.

Added OSGI example for custom dwr servlet instance.

Ant deployment. (Will need to be converted to Gradle if so desired.)

Works with 2.5.1.

Does not work with 2.3.2. Possibly a context issue?

Details on 2.3.2 error:
[06/12/13 14:30:51:793 EST] ERROR impl.DefaultCreatorManager: Class not found: 'CustomAjax'
[06/12/13 14:30:51:793 EST] WARN impl.DefaultCreatorManager: Names of known classes are: __Data __System
[06/12/13 14:30:51:793 EST] WARN servlet.ExceptionHandler: Error: java.lang.SecurityException: Class not found