Add grunt dev dependenices back since they are needed by the Travis grunt scripts

hamorphis · hamorphis · commit 8061a609ae8b · 2016-07-12T12:59:40.000+03:00
diff --git a/package.json b/package.json
@@ -12,11 +12,14 @@
     "grunt-contrib-copy": "git+https://github.com/ErjanGavalji/grunt-contrib-copy.git#1c976a133210be4ce8c96313f5daf14833f7f8f9",
     "grunt-env": "0.4.4",
     "grunt-exec": "0.4.6",
+    "grunt-mkdir": "0.1.2",
+    "grunt-multi-dest": "1.0.0",
     "grunt-shell": "1.1.2",
     "grunt-simple-mocha": "0.4.0",
     "grunt-ts": "5.3.2",
     "grunt-tslint": "3.0.3",
     "grunt-typedoc": "0.2.3",
+    "grunt-untar": "0.0.1",
     "markdown-snippet-injector": "0.1.1",
     "mocha": "2.2.5",
     "nativescript-typedoc-theme": "0.0.1",
