Layouts and LEDs

This patchset introduces keyboard controlling: leds(numlock, capslock) and layouts(#47).
greeter/KeyboardModel - main functionality. LED's and Layouts are exposed to QML. It works via XCB-XKB.

To demonstration purposes i changed some components and ~~MAUI~~ maldives theme
components/ComboBox - now updates when index changes, and is more customizable: it is possible to delegate rows.
~~components/ImageBox - has new state, where it show message 'Caps lock is ON'. (probably that was a bad idea :P)~~
components/PasswordBox - same as TextBox, but has waning icon with popup.
~~themes/maui - has layout selection in top row and scroll lock indication in user pictureboxes.~~
themes/maldives - added layout selection and scroll lock indication in passwordbox. And counry flags from fbxkb
Screenshot:
![2013-07-07_1280x1024 1373190474](https://f.cloud.github.com/assets/1583368/757776/2d99adc6-e6ea-11e2-9720-cd16eefbd28d.png)

Also there is now a option to turn numlock on/off on start. #66

Also merged minor changes to my previous multimonitor fix