CLI should watch package.json files in the application

To work properly in LiveSync operation, CLI should watch the following package.json files:
- root's package.json
- package.json inside (app/src) folder
- package.json files of nativescript plugins inside node_modules

NOTE: This is a must for kinvey-nativescript-sdk plugin which have specific logic of modifying its own content when a change in the `app/package.json` file occurs.
