Issue #2883384 by bojanz: Provide a way to install without Composer

ludwig.json

+{
+  "require": {
+    "doctrine/collections": {
+      "version" : "v1.4.0",
+      "url": "https://github.com/doctrine/collections/archive/v1.4.0.zip"
+    },
+    "commerceguys/enum": {
+      "version" : "v1.0",
+      "url": "https://github.com/commerceguys/enum/archive/v1.0.zip"
+    },
+    "commerceguys/intl": {
+      "version" : "v0.7.4",
+      "url": "https://github.com/commerceguys/intl/archive/v0.7.4.zip"
+    },
+    "commerceguys/addressing": {
+      "version" : "v1.0.0-beta3",
+      "url": "https://github.com/commerceguys/addressing/archive/v1.0.0-beta3.zip"
+    }
+  }
+}