Add the restrict_by_ip module

This commit does not include configuration.

https://github.com/18F/nsf/issues/139

Author: fureigh

composer.json

@@ -15,7 +15,8 @@
         "drupal/embed": "^1.0",
         "drupal/entity_browser": "^2.0",
         "drupal/ctools": "^3.0",
-        "drupal/media_entity": "^1.7"
+        "drupal/media_entity": "^1.7",
+        "drupal/restrict_by_ip": "4.x-dev"
     },
     "replace": {
         "drupal/core": "^8.4"