fix(ios): Disable importHelpers in tsconfig of the plugin

Set importHelpers=false in plugs tsconfig since otherwise the demo app doesn’t work as expected in iOS.

Author: Veselina Radeva

test/e2e/package.json

@@ -6,10 +6,10 @@
   "nativescript": {
     "id": "org.nativescript.sampleApp",
     "tns-ios": {
-      "version": "3.0.0"
+      "version": "3.0.0-rc.1-2017-3-28-2"
     },
     "tns-android": {
-      "version": "2.5.0"
+      "version": "3.0.0-rc.1"
     }
   },
   "dependencies": {

tsconfig.json

@@ -9,7 +9,7 @@
         "noEmitOnError": true,
         "skipDefaultLibCheck": true,
         "skipLibCheck": true,
-        "importHelpers": true,
+        "importHelpers": false,
         "lib": [
             "es2015",
             "es2015.iterable",