Dummy methods for recovery api
Reorganized mixins hierarchy. Added order mixin template
Allowed for _settattrs to be used outside update method
Merge branch 'order_recovery' into production
Updated as_dict method for models. Changes on groupon payment. Extracted order fields into mixin
Added fuzzy flag for groupon search
Updated signal handler signature
Fixed locale detection. Used Babel standartized tools
Changed groupon validation error format & status code passed. Needed for support IE XDR
Changed error reporting
Purged widget support. Refactored customer processing
Extracted order and cart structures into the separate mixins
Cutted out serrvice data provisioning
Changed sum calculation to aggregation expression
Renamed ticket details transfer attribute
Updated groupon payment and verification process according to the data structure changes
Expanded allowed headers list
Extracted order creation from base mixin
Updated payment method according to Order model changes
Updated methods naming to be accessible form the derived classes