WIP: Ember cleanup
Fix up rendering of states pieces
Display method on shipments once again
Make content display on all state pages again
Move shipping rate updating logic into shipment model
Call checkout_steps before the totals, so that shipment_total gets updated

Right now you're probably saying WTF!!! Let me explain:

https://twitter.com/ryanbigg/status/462095134826299392
https://twitter.com/ryanbigg/status/462095337318907904
Get content correctly in stockPicker controller
Set active link for states
Get content correctly in stockPicker controller