Use the after-watch hook

Use the after-watch hook, which is raised when LiveSync operation stops and kill currently running node-sass compiler.  - This change was missed out in #40, which is copy of NativeScript/nativescript-dev-typescript#34

Author: Nadezhda Atanasova

package.json

@@ -31,6 +31,11 @@
         "type": "before-watch",
         "script": "lib/watch.js",
         "inject": true
+      },
+      {
+        "type": "after-watch",
+        "script": "lib/after-watch.js",
+        "inject": true
       }
     ],
     "tns-ios": {
@@ -62,4 +67,4 @@
   },
   "homepage": "https://github.com/toddanglin/nativescript-dev-sass",
   "readmeFilename": "README.md"
-}
+}