Added AddressbookSettingsActivity, and a link via settings. It's now possible to update subscriptions.txt on android.

- Split out WebViewClient to own class
- Clean up status a little
- Check for new install or new version at startup
- Popup dialog on new install or version
- Only merge config files on new version
- Add release notes and licenses screens

Next step: Update the scripts and docs to point to
../i2p.i2p/ for everything.

  - Move the classes around
  - Split into Activity and Service
  - Add status bar notification
  - More config changes