Added new properties in API
Added exchangeRate to Invoice object
Merge pull request #47 from ruudk/patch-10

Added exchangeRate to Invoice object
Added payment method and allow empty method
spaces/tabs
Merge pull request #49 from bluetools/issue_48

Issue 48
Email is not required according to the API docs, so this should not be in $_requiredAttr.
Test to check insertion of contact without email set.
Merge pull request #50 from stephangroen/master

Remove email from required attributes for Contact
Copy invoice / create credit
Typo
Merge pull request #53 from bluetools/master

Added copy and credit invoice
Merge pull request #54 from bluetools/copy_invoice

Copy invoice
Only send changed attributes to Moneybird
resolved conflicts