tmux: import from packages, update to latest

Signed-off-by: Maxim Storchak <m.storchak@gmail.com>
tmux: add myself as a maintainer

Signed-off-by: Maxim Storchak <m.storchak@gmail.com>
Merge pull request #20 from mstorchak/tmux

tmux: import from packages, update to the latest release, split patches