add sinatra reloader


![download](https://f.cloud.github.com/assets/803625/2293117/b45ecf22-a066-11e3-8ad2-638d1e606811.jpeg)


- Added sinatra reloader so the server can auto reload when a component model is updated.

@kenoir Could you take a look if we can add this please?

@Guntrisoft @samfrench Please let me know if this works for you?