Give up setting vars in [user] section by _gitconfig.

    * Overrides after mixins by [include] seem to rewrite
      each whole section...
(Vim) For tab operations: functions and keymaps.

    * keymap for :tabnew.
    * keymap & command for :tabmove [<number> - 1]
      (move tab by visible index).
    * func. & keymap for moving tab to last & open back
      the buffer at prev. position.
    * keymap & command for opening the tab by names of
      buffers.
Shortcut for opening directory with NERDTree.
Prettify & fix basic settings in _vimrc.

    * Improve readability @ _vimrc.
    * Fix NeoBundle setting.
    * Remove statusline setting (lightline.vim replaces).
    * Expand encoding trial list for vim.
    * Remove unused settings in _vimrc.
    * Safer setting for tabmove in vim.
Wholly rewrite the install script:

    * DRY for settings
    * Load site_<dotfile> in _<dotfile>.
    * Rename tmux.conf to ease scripting.

    * Give up, or i now don't need auto update or uninstall.
    * Give up .gvimrc
Modify Nerdtree keymaps.
Tagbar: New plugin with NeoBundle / for ctags.
Give up completely Windows support for install.sh.
Separate rbenv setting in _zshrc as env dependent.
Use CtrlP for buffer selector (Vim).
Use README to note targets & prerequisites for config files.