Support important, view_content_link, return_path_domain, subaccount.

Closes #49.

docs/history.rst

@@ -3,7 +3,9 @@ Release Notes
 
 Version 0.7 (development):
 
-* Support for Mandrill send options :attr:`async`, :attr:`ip_pool`, and :attr:`send_at`
+* Support for Mandrill send options :attr:`async`, :attr:`important`,
+  :attr:`ip_pool`, :attr:`return_path_domain`, :attr:`send_at`,
+  :attr:`subaccount`, and :attr:`view_content_link`
 
 
 Version 0.6:

docs/usage/sending_mail.rst

@@ -111,6 +111,10 @@ Most of the options from the Mandrill
 
 .. These attributes are in the same order as they appear in the Mandrill API docs...
 
+.. attribute:: important
+
+    ``Boolean``: whether Mandrill should send this message ahead of non-important ones.
+
 .. attribute:: track_opens
 
     ``Boolean``: whether Mandrill should enable open-tracking for this message.
@@ -156,6 +160,10 @@ Most of the options from the Mandrill
     ``Boolean``: whether Mandrill should include all recipients in the "to" message header.
     Default from your Mandrill account settings.
 
+.. attribute:: view_content_link
+
+    ``Boolean``: set False on sensitive messages to instruct Mandrill not to log the content.
+
 .. attribute:: tracking_domain
 
     ``str``: domain Mandrill should use to rewrite tracked links and host tracking pixels
@@ -164,10 +172,14 @@ Most of the options from the Mandrill
 
 .. attribute:: signing_domain
 
-    ``str``: domain Mandrill should for DKIM signing and SPF on this message.
+    ``str``: domain Mandrill should use for DKIM signing and SPF on this message.
     Useful if you send email from multiple domains.
     Default from your Mandrill account settings.
 
+.. attribute:: return_path_domain
+
+    ``str``: domain Mandrill should use for the message's return-path.
+
 .. attribute:: global_merge_vars
 
     ``dict``: merge variables to use for all recipients (most useful with :ref:`mandrill-templates`). ::
@@ -193,6 +205,10 @@ Most of the options from the Mandrill
 
         message.tags = ["Order Confirmation", "Test Variant A"]
 
+.. attribute:: subaccount
+
+    ``str``: the ID of one of your subaccounts to use for sending this message.
+
 .. attribute:: google_analytics_domains
 
     ``list`` of ``str``: domain names for links where Mandrill should add Google Analytics