Automatic hot reload

[groenroos]

Include in Sapling (maybe as a separate package?) a way for it to automatically reload any browser windows when changes are made to;

• Views
• Routes
• Permissions
• Config
• Models
• Assets (once Asset building cli#4 resolves)

Obviously if production is on, this would be turned off.

Would need to find some way to inject the required JS into the view, which might get dirty and a bit awkward given the external render drivers.