Summary buttons in Qml

The inner contents for Vehicle Summary buttons is now generated from Qml provided by the VehicleComponent. This allows the autopilot plugin to do any sort of UI it wants inside the summary buttons. It also means all values within the summary buttons are live and will update as parameters change. Also implemented summary button information for Safety Component.
![screen shot 2014-12-24 at 6 27 56 pm 1](https://cloud.githubusercontent.com/assets/5876851/5551913/e08326dc-8b9a-11e4-9fe0-813ddd4d5bf2.png)