adding support for manual invoice fields
Merge pull request #59 from recurly/manual-invoice

adding support for manual invoice fields
added support for address and vat_number on account
code cleanup
Merge pull request #60 from recurly/add-address

added support for address and vat_number on account
new release
Merge pull request #61 from recurly/add-address

new release
Fixed a bug where an error could be thrown due to an empty XML string.

Error: DOMDocument::loadXML(): Empty string supplied as input.

Occurred when creating a new transaction based on an account credit.
tests; added for PR #62
tests; clean up
release 2.2.2
Remove old taxable parameter.