fix filename
edit zsh theme for tmux-powerline
remove submodule tmux-mem-cpu-load
edit appearance of zsh
edit appearance of tmux-powerline

 * add theme of tmux-powerline
 * add segments of tmux-powerline
fix filename ( .XXX -> dot.XXX )

  * fix install.sh
  * fix .gitignore
  * fix .gitmodules
add dot.gitignore
add key bindings

  * mute tmux-powerline
edit appearance of tmux
edit appearance of zsh
add segment of load average