Simplify the address model

Issue #190
Improve checkout address tests

Issue #190
Improve checkout templates and styles

Issue #190
Add compressed css

Issue #190
Simplify userprofile views code

* add translations to error messages
* remove request method checking
Set first address as a default billing & shipping
Set new address data to payment

Issue #190
Improve short address snippet

Issue #190
Merge pull request #198 from mirumee/simplyfy-address

Simplyfy address