[Framework] Begin adding registration phase

Begin implementation registration phase of framework
layer initialization process. This phase is responsible
for registering resolved extensions with Angular, in a
manner than individual extensions can later request
dependencies from. WTD-518.

platform/framework/src/Constants.js

@@ -8,6 +8,7 @@ define({
     BUNDLE_LISTING_FILE: "bundles.json",
     BUNDLE_FILE: "bundle.json",
     SEPARATOR: "/",
+    EXTENSION_SUFFIX: "[]",
     DEFAULT_BUNDLE: {
         "sources": "src",
         "resources": "res",