theme mu4e

* Alternate between green and blue for cited text.  Older cites are
  darker.
* Use fairly dark face for replied and trashed messages.
change font-lock-warning-face's appearance

While I proposed the old apprearance I find it to be quite ugly and
actually changed it soon after you merged my previous suggestion.
Merge pull request #91 from tarsius/font-lock

change font-lock-warning-face's appearance
Merge pull request #92 from tarsius/mu4e

theme mu4e