* mu4e/org-mu4e.el (org-mu4e-store-link): Add capture template keywords

For other email links (e.g., wl, mh, gnus), a number of keywords are
defined in org capture templates.  This makes these keywords available
for use in captures from mu4e.

http://orgmode.org/manual/Template-expansion.html

Inspiration from Roelof Burger
https://groups.google.com/d/msg/mu-discuss/4sffZofVKAY/aVTdVYoVyiUJ
Add different face attribute for the mode-line

There is an additional face attribute for the mode-line.
mu4e: Mention need for multiple account SMTP credentials in manual.
Merge pull request #486 from holocronweaver/master

mu4e: Mention need for multiple account SMTP credentials in manual.
Merge pull request #365 from jschwab/add-capture-template-keywords

* mu4e/org-mu4e.el (org-mu4e-store-link): Add capture template keywords
mu4e: unbreak sending mail when gnus-agents is unplugged in gnus (#462)
Update mu4e-headers.el
Update mu4e-vars.el
Merge pull request #478 from odi/master

mu4e: Add different face attribute for the mode-line
mu4e: Use save-excursion to leave point before signature

Based on the patch by janisteunissen.
  https://github.com/jannisteunissen/mu/commit/7f8b598e009c36ad0d6d2808c7a83341f0051f8f