ETCH-273 Removing hardcoded HelloWorld string from compiler

This patch removes the hardcoded HelloWorld example call from
the velocity template

Change-Id: I14672b6c474f5da225a06a6f599daf6610270997

git-svn-id: https://svn.apache.org/repos/asf/etch/trunk@1518248 13f79535-47bb-0310-9956-ffa450edef68