[ALOY-743] Example showing commonjs UI components used in XML

Ticket: [https://github.com/appcelerator/alloy/compare/ALOY-743](https://github.com/appcelerator/alloy/compare/ALOY-743)

## Associated PRS

* [https://github.com/appcelerator/alloy/pull/178](https://github.com/appcelerator/alloy/pull/178)
* [https://github.com/appcelerator/alloy/pull/179](https://github.com/appcelerator/alloy/pull/179)
* [https://github.com/appcelerator/alloy/pull/186](https://github.com/appcelerator/alloy/pull/186)