fix(all): add corejs

Author: bryanrsmith

config.js

@@ -17,14 +17,11 @@ System.config({
   "map": {
     "babel": "npm:babel-core@5.1.13",
     "babel-runtime": "npm:babel-runtime@5.1.13",
-    "core-js": "npm:core-js@0.9.5",
+    "core-js": "npm:core-js@0.9.18",
     "github:jspm/nodelibs-process@0.1.1": {
       "process": "npm:process@0.10.1"
     },
-    "npm:core-js@0.4.10": {
-      "process": "github:jspm/nodelibs-process@0.1.1"
-    },
-    "npm:core-js@0.9.5": {
+    "npm:core-js@0.9.18": {
       "process": "github:jspm/nodelibs-process@0.1.1"
     }
   }

package.json

@@ -25,7 +25,9 @@
     "directories": {
       "lib": "dist/amd"
     },
-    "dependencies": {},
+    "dependencies": {
+      "core-js": "npm:core-js@^0.9.18"
+    },
     "devDependencies": {
       "babel": "npm:babel-core@^5.1.13",
       "babel-runtime": "npm:babel-runtime@^5.1.13",

src/http-client-configuration.js

@@ -1,3 +1,5 @@
+import core from 'core-js';
+
 /**
  * A class for configuring HttpClients.
  *

src/http-client.js

@@ -1,5 +1,6 @@
 import {HttpClientConfiguration} from './http-client-configuration';
 import {mergeHeaders} from './util';
+import core from 'core-js';
 
 /**
  * An HTTP client based on the Fetch API.