Merge remote-tracking branch 'upstream/master'

New stuff from upstream
Merge remote-tracking branch 'upstream/master': new changes and merged features
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master': Pull latest updates
initial commit. Probably broken.
Remove selecting of next message.
It doesn't seem to be necessary, and it would always fail if there was only
one message in the inbox.
Tabs are the root of all evil
more comments on the mark unread implementation
Merge pull request #335 from nimdahk/markUnread

"Mark Unread" in Inbox