Components can now be re-ordered, closes #165

Nice and easy re-ordering using [Sortable](https://rubaxa.github.io/Sortable/).

![screenshot 2015-01-01 13 38 07](https://cloud.githubusercontent.com/assets/246103/5592254/7c0e6fc8-91bb-11e4-86c8-e20dc44cf253.png)

Using `.ion-drag` for a handle.