Beginning of the render_tag function.

Beginning of the render_tag function. At this point I need to figure out how to access elements in the context.

src/bin.rs

@@ -41,7 +41,7 @@ fn main() {
     println!(
         "{}",
         dust_renderer
-            .render(main_template_name, context)
+            .render(main_template_name, &context)
             .expect("Failed to render")
     );
 }