[Package] Implementation of Tizen Package API

This branch includes a fully functional implementation of Tizen Package API. 

API specification can be found at:
https://developer.tizen.org/dev-guide/2.2.0/org.tizen.web.device.apireference/tizen/package.html

BUG=XWALK-443
```
  if (typeof path !== 'string' ||
      onsuccess === undefined ||
      onerror && typeof onerror !== 'function')
```