Privacy Panel new pull request

This is a new pull request. We had to remove the old one due to big problems with git and some Schroedinger patches....
Now I can see that most of the apps have their own mock_async_storage file that does the same thing :) Just choose one file and move it to shared :)

https://github.com/mozilla-b2g/gaia/blob/master/apps/settings/test/unit/mock_async_storage.js
https://github.com/mozilla-b2g/gaia/blob/master/apps/communications/contacts/test/unit/mock_asyncstorage.js
https://github.com/mozilla-b2g/gaia/blob/master/apps/system/test/unit/mock_asyncStorage.js

and many more (found 9 of them that does the same thing) why previously you didn;t put that to shared?