Changed the template application to Hello World.

This provides a more useful template when making a simple Makefile
project.

Pulled out of eclipse-cdt#314

build/org.eclipse.cdt.make.core/templates/simple/main.cpp

@@ -1,4 +1,6 @@
+#include <iostream>
 
 int main(int argc, char **argv) {
+	std::cout << "Hello World" << std::endl;
 	return 0;
 }