Add PebbleKit JavaScript settings page to Revolution watchface

The new settings page allows you to select American date format, vibrate on the hour, invert watchface colors, and choose between displaying year and seconds. Note that the current code requires the watchface to be reloaded before changes take effect.

Screenshot:
![settings](https://cloud.githubusercontent.com/assets/223403/3170959/aa358a82-ebbf-11e3-9d93-20a45dff0e21.png)

PBW file:
https://builds.cloudpebble.net/53958ad8-602c-44ac-9155-3a45d83a9e29/watchface.pbw