Merge branch 'upstream'
adjust icedove depends to >= 17.0.3 and <= 17.1
document changes and release 1:17.0.3-1
Imported Upstream version 17.0.4
Merge tag 'upstream/17.0.4'

Upstream version 17.0.4

# gpg: Unterschrift vom Mo 18 Mär 2013 13:20:32 EDT mittels RSA-Schlüssel ID A74420EF
# gpg: Korrekte Unterschrift von "Christoph Goehre <christoph.goehre@gmx.de>"
# gpg:                     alias "Christoph Goehre <chris@sigxcpu.org>"
debian/control: update Standard-Version to 3.9.4
debian/control: remove obsolete DM-Upload-Allowed" field
adjust icedove depends to >= 17.0.4
document changes and release 1:17.0.4-1