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(Current)InvoiceProxy can figure out what parts of Handle they need
Bulk fetch data for all handles instead of one at a time
FindByDateInterval should live inside the Economic namespace
Don't test on Rubinius

16 minute build durations seem to indicate that Rubinius isn't supported yet
Make it easy to include specific handle values in SOAP requests
Adds SerialNumber as a possible key/value for Handles

Used by Entry, CreditorEntry and DebtorEntry.
Factory method for creating new handles
Handle should know if it's empty
Tighten up entity equality specs
Handles aren't regular properties

They need to be handled on their own as they are composed of other properties
(and different properties for different entities at that).
Fix issue where only one line could be added to invoice
Preparing for next release
Hi Coveralls
Badges\!
Better naming
Working towards decoupling entities from the SOAP implementation
Entity shouldn't know how to camelBackCase a string
Cast off our Ruby 1.8.7 and ActiveSupport shackles