add single files, secure server, hello world

single_file_tests/print_file.dart

@@ -0,0 +1,13 @@
+#!/usr/bin/env dart
+
+import 'dart:io';
+
+main(List<String> args) async {
+  print("[INFO] Arguments: $args");
+  if (args.length == 0) {
+    print("No file assigned.");
+    return;
+  }
+  final contents = await new File(args[0]).readAsString();
+  print(contents);
+}