store external id for actions created inside ActionKit within Prague.
refactor ActionKit notifier so formatting logic lives in an adapter class, not charge model. Imorove postcode handling.
expose date aggregates via API so we can display per petition and per organziation donation histories inside Agra.
fix and spec the config hash now that it is in the action object instead of charge model.
Merge pull request #28 from controlshift/refactor_ak_sync

Refactor AK Sync
merge from master.
fix issues from @anero in charges_controller.
remove comments.