Enable to do some commands without releasing Ctrl key

When doing "next-window" 3 times,

Old:
  "C-t j C-t j C-t j" ->
  Press Ctrl, Press T, Release Ctrl, Release T, Press J, Release J,
  Press Ctrl, Press T, Release Ctrl, Release T, Press J, Release J,
  Press Ctrl, Press T, Release Ctrl, Release T, Press J, Release J

New:
  "C-t C-j C-t C-j C-t C-j" ->
  Press Ctrl, Press T, Release T, Press J, Release J,
              Press T, Release T, Press J, Release J,
              Press T, Release T, Press J, Release J, Release Ctrl

The following commands are enable to do with "New" key strokes now.

* next-window
* previous-window
* select-pane -t :.+
* last-window
* copy-mode
* paste-buffer
Remove unite.vim, vimproc and vimshell installations
Fix the public domain declaration