* Add filename param to attach_inline_image
* Add attach_inline_image_file function
(parallels EmailMessage.attach and attach_file)
* Use `Content-Disposition: inline` to decide
whether an attachment should be handled inline
(whether or not it's an image, and whether or not
it has a Content-ID)
* Stop conflating filename and Content-ID, for
ESPs that allow both. (Solves problem where
Google Inbox was displaying inline images
as attachments when sent through SendGrid.)
Interpret dates and naive datetimes as Django's
current_timezone (rather than UTC like Djrill did).
This should be more likely to behave as expected
when running with a non-UTC TIME_ZONE setting.
(Prep for installing backends as package extras)
* Extract AnymailRequestsBackend and RequestsPayload
to base_requests.py
* Don't define/require requests exceptions when requests
not available
For MANDRILL_API_KEY (e.g.,), look for these settings:
* ANYMAIL = { 'MANDRILL_API_KEY': '...' }
* ANYMAIL_MANDRILL_API_KEY = "..."
* MANDRILL_API_KEY = "..."
(the "bare" third version is used only for settings that
might be reasonably shared with other apps, like api keys)
