feat(package): update to angular v4

Author: narainsagar

package.json

@@ -21,10 +21,10 @@
   "dependencies": {
   },
   "devDependencies": {
-    "@angular/common": "^2.4.3",
-    "@angular/compiler": "^2.4.3",
-    "@angular/core": "^2.4.3",
-    "@angular/forms": "^2.4.3",
+    "@angular/common": "^4.0.0",
+    "@angular/compiler": "^4.0.0",
+    "@angular/core": "^4.0.0",
+    "@angular/forms": "^4.0.0",
     "rxjs": "^5.1.0",
     "zone.js": "^0.7.6",
     "codelyzer": "^2.0.0",