Bug 964776 - [Flatfish][Settings] No vibrating alert motor, "Vibrate" op...

...tion should be removed from Settings

* Rename customization/sensors.json to customization/device-features.json
* Modify build.js to replace sensors.json with device-features.json
* Show/Hide 'Vibrate' checkbox according to the 'vibration' value in device-features.json
* Update .gitignore and integration test