killbill-memoizeit

Implement refund endpoint with adjustment logics

Add refund API for invoice (untested)

Fix for chargebacks

Fix credit endpoint

Fix build previously broken with invoice mofifications

Fix invoice items issues in existing code + refactoring a bit

Complete invoice changes before new features

Fi existing tests to pass with new SQL format

Aggregation for invoice item tables + introduction of new invoice …

item types

Merge branch 'integration' of github.com:ning/killbill …

into integration