The Hello servlet displays "Hello, World!".
To install the Hello servlet install the Hello Servlet bundle into a running
ServiceTango instance by using the URL
file:///<ServiceTango-Home>/src/examples/org/servicetango/service/http/META-INF.jar
The Hello Servlet bundle will register a servlet with the local HTTP service. This servlet
will by installed into the local web server namespace at /hello.
After installing the Hello Servlet bundle the Hello Servlet may be accessing with a
web browser using the URL http://<local-machine-name>/hello.