Add WP8-variant of datepicker-plugin from leecrossley

I'd very much like to enable 1 plugin on PG-Build to use a datepicker on Android, iOS and WP8. As you've already combined iOS and Android and submitted it to PG-build, I was hoping you could add WP8-support and push a new version to PG-Build.

*Note:* I'm not the author of the WP8-plugin, I simply copied and adjusted the plugin from https://github.com/leecrossley/cordova-plugin-datetime-picker