chore(testapp): remove unnecessary dependency and fix node 4.0 install

Author: juliemr

Diff for: testapp/hybrid/systemjs.config.js

@@ -26,7 +26,6 @@
 
       // other libraries
       'rxjs':                       'npm:rxjs',
-      'angular2-in-memory-web-api': 'npm:angular2-in-memory-web-api',
     },
     // packages tells the System loader how to load when no filename and/or no extension
     packages: {

Diff for: testapp/ng2/system-config.js

@@ -25,7 +25,6 @@
 
       // other libraries
       'rxjs':                       'npm:rxjs',
-      'angular2-in-memory-web-api': 'npm:angular2-in-memory-web-api',
     },
     // packages tells the System loader how to load when no filename and/or no extension
     packages: {

Diff for: testapp/package.json

@@ -22,8 +22,7 @@
     "core-js": "2.4.1",
     "reflect-metadata": "0.1.3",
     "rxjs": "5.0.0-beta.12",
-    "zone.js": "0.6.21",
-    "angular2-in-memory-web-api": "0.0.19"
+    "zone.js": "0.6.21"
   },
   "devDependencies": {
     "concurrently": "2.2.0",