* mu: store date as 0 if it does not exist; this allows searching
* mu4e/mu4e-view.el (mu4e-mark-region-code): New function to highlight region marked with `message-mark-inserted-region'.
* mu4e/mu4e-vars.el (mu4e-region-code): New face.
* mu4e/mu4e-view.el (mu4e-mark-region-code): Add docstring.
Merge pull request #403 from thierryvolpiatto/master

* mu4e: format regions quoted with `message-mark-inserted-region'