Added tax rates and products
Added missing docs files
fixes #17
fixes #16
fixes #18
appendXML fails on PHP5.4
Added 'credit_invoice' as a payment method, fixes #21
Merge pull request #22 from jelrikvh/master

'credit_invoice' missing from payment method list
Added composer file
Updated README
Merge pull request #26 from ruudk/composer

Added support for Composer + Updated readme
Fixed issues with extending domain models, added tests for extension
Fixed composer.json autoload
Merge pull request #28 from ruudk/patch-2

Fixed composer.json autoload
Update README.md
Merge pull request #29 from ruudk/patch-3

Update README.md
Merge branch 'master' of https://github.com/jelrikvh/moneybird_php_api
fixes #27: tests failed on PR
fixes #30
fixes #31