JustType: add a Just Type field in the main view. By default, the event ...

...is interpreted by the WindowManager as a request to switch to expanded launcher display.

![screenshot from 2013-09-28 17 18 27](https://f.cloud.github.com/assets/2496392/1231384/4462b932-2851-11e3-9778-68fd472f0ba0.png)

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>