[FIX] Don't run some operations on ComposeBackEnd if no delegate is available. [#660 state:fixed]
Appropriately update sign and encrypt status in composing windows on incoming key change notifications. [#663 state:fixed]
Add the actual version not only build number to the X-PGP-Agent header.
Merge branch 'dev' of https://github.com/GPGTools/GPGMail into dev