Added minSdkVersion to manifest file, fixes weird layout problem

Using a Samsung Note 10.1 2014 edition (tablet) in landscape mode, this happens: 
![screenshot_2013-11-14-09-59-06](https://f.cloud.github.com/assets/817123/1540854/ad7a3204-4d29-11e3-9044-9e046ff0ff35.png)

After adding minSdkVersion:

![screenshot_2013-11-14-09-59-43](https://f.cloud.github.com/assets/817123/1540859/bba6f6c8-4d29-11e3-9148-0a01df28f7ce.png)
Keep in mind that it's a 10.1" display, so that logo was HUGE and you could not scroll down or otherwise access the buttons below.

SDK version 4 is the lowest version that still works properly. Using later versions (15+ or so) gives the app a different look (blue-ish buttons and added Action Bar), but no difference otherwise.