Finished implementing Named blocks and inline partials.

src/renderer/renderer.rs

@@ -205,7 +205,22 @@ impl<'a> DustRenderer<'a> {
                 return Ok("".to_owned());
             }
             DustTag::DTBlock(named_block) => {
-                // TODO: Implement
+                match blocks.get_block(named_block.name) {
+                    None => match &named_block.contents {
+                        None => return Ok("".to_owned()),
+                        Some(body) => {
+                            let rendered_content = self.render_body(body, breadcrumbs, blocks)?;
+                            return Ok(rendered_content);
+                        }
+                    },
+                    Some(interior) => match interior {
+                        None => return Ok("".to_owned()),
+                        Some(body) => {
+                            let rendered_content = self.render_body(body, breadcrumbs, blocks)?;
+                            return Ok(rendered_content);
+                        }
+                    },
+                };
             }
             _ => (), // TODO: Implement the rest
         }