Add german translation.
Merge pull request #63 from meinekleinefarm/translation

Add german translation.
Fix Address.required_fields to handle all presence validators
fixed current_user -> spree_current_user
Fix engine initializer token

This looks like it was copied from spree_advanced_cart code.
It could be a problem if you want your engines initializer to load before or after this specific initializer.
Updating specs to run and mostly pass on 1.2.x

This probably fixes a bunch of spec issues on 1.3.x as well
Gemfile bump for 1.3.x testing
Another lingering current_user --> spree_current_user