sbrink/interfax — pull request #9 by koozie (2012-04-16 17:16:01+00:00)
Title: Add support for setting custom fax header

Add support for a new setter. Set a custom fax header as describe in the sendfax documents.
http://www.interfax.net/en/dev/webservice/reference/sendfaxex_2

Let me know if the comments are too wordy.