Remove app from App Drawer

Removing the category from the IntentFilter removes it from the App
Drawer.
The StealthDialerReceiver now doesn't include that category either.

To make it possible to compile and run the app you need to change the
Run/Debug configurations from 'Launch default Activity' to 'Do not
launch Activity.'
Fix issue with BroadcastReceiver no longer receiving calls.

On first start the app removes it's app icon from the list of apps.
The Broadcast receiver now correctly opens the app on dialing the right
number.
Merge branch 'master' into app-drawer-hiding
Merge pull request #46 from AlexKolpa/app-drawer-hiding

Remove app from App Drawer