Main Activity, layout for 2.7 inch screens

Inspired by https://github.com/mozilla/MozStumbler/pull/632
I tried to fix the main screen so that it would work -however unattractively- on small screens.

2.7 inch
https://www.dropbox.com/s/qydvilgu7sw4ypk/Screenshot%202014-06-23%2020.46.37.png
https://www.dropbox.com/s/yc63co1d1wg8fpd/Screenshot%202014-06-23%2020.46.44.png

3.2 inch
https://www.dropbox.com/s/yegdtq2esfou4sv/Screenshot%202014-06-23%2020.46.56.png