Mailbox-org-api

Added missing features to mail_list to fully implement the call of the mailbox.org API

Added support for parameter "payment_type" in function account_set.

Added undocumented parameters for account.set

What's Changed
* Added additionalmailaccount.add and additionalmailaccount.delete by heshsum in https://github.com/heshsum/mailbox-org-api/pull/33


**Full Changelog**: https://github.com/heshsum/mailbox-org-api/compare/0.6...0.7

What's Changed
* Added (nearly) all calls available in the API:
* Added domain.validate.spf by heshsum in https://github.com/heshsum/mailbox-org-api/pull/14
* Added mail.blacklist.* calls by heshsum in https://github.com/heshsum/mailbox-org-api/pull/27
* Added mail.passwordreset.* functions by heshsum in https://github.com/heshsum/mailbox-org-api/pull/28
* Added mail.spamprotect.* calls by heshsum in https://github.com/heshsum/mailbox-org-api/pull/29
* Added mailinglist calls by heshsum in https://github.com/heshsum/mailbox-org-api/pull/30
* Added mail.vacation.* calls by heshsum in https://github.com/heshsum/mailbox-org-api/pull/31
* Made debug output optional, added documentation by heshsum in https://github.com/heshsum/mailbox-org-api/pull/15

**Full Changelog**: https://github.com/heshsum/mailbox-org-api/compare/0.5...0.6

**Full Changelog**: https://github.com/heshsum/mailbox-org-api/compare/0.4...0.5

- Changed behavior of account_invoice_get_pdf to take invoice_id instead of token
- Big overhaul of the documentation