Start adding db download/upload, migrate graph to async/await

src/cli/mod.rs

@@ -174,9 +174,11 @@ impl Cli {
                 let reader = BufReader::new(file);
                 let graph = serde_json::from_reader(reader)?;
                 let graph = RunnableGraph::from_graph(graph);
+                // TODO: Possible to await here?
                 graph.run_default_tasks(threads, |id, status| {
                     info!("Node with id {} finished with status {:?}", id, status)
-                })
+                });
+                Ok(())
             }
             Commands::GenerateSchema { output } => {
                 let schema = schema_for!(Graph);