Log Message:
update to i3-tree-pr3

from RELEASE-NOTES-tree-pr3:
What should be working in this release?
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 - Basic window management, navigation, moving
 - Fullscreen mode, correct aspect ratio
 - Stacked/Tabbed layout, floating mode
 - Splitting (for fancy layouts), resizing
 - Restarts (preserving the layout), crash handler
 - RandR changes, keyboard layout changes
 - Dock clients
 - Assignments
 - i3bar, get it from http://git.merovius.de/

What is not working in this release?
------------------------------------

 - Configfile compatibility