Support news attachments.
ViewPager in fragment and two-pane layout.

. Move ViewPager inside a fragment so it can be reused in the two-pane
  layout.
. Two-pane layout now works properly. Had to deal with a race condition
  which was kind of interesting.
. Added GPL v3 license.
. Removed the background selector - let's stick with the Android
  default style for now.
. Use dimens and resource values to control font sizes on different
  devices.