Remove Profile step in Order.
Re-add country and subregion to donation list.
Small cleanups in app.js.

We don't need to specify the Ember-Data revision anymore.
Adjust some formmatting.
Add Cart link to main page.
Fix money still needed on donations and vouchers.
Add link to profile page on thank you page.
Fix problems with project list in thank you page.
Fix error message for donation amount.
PEP8
Adjustment on last payment page on our site.
Merge pull request #410 from benkonrath/frontend-donation-update

Frontend donation update