Install vim-plugin if not installed.

" Install vim-plug if it's not already installed.
   if empty(glob('~/.vim/autoload/plug.vim'))
           silent !curl -fLo ~/.vim/autoload/plug.vim --create-dirs \ https://raw.         github.com/junegunn/vim-plug/master/plug.vim
           autocmd VimEnter * PlugInstall --sync | source $MYVIMRC
  endif

Install vim-plugin if not installed.#

Install vim-plugin if not installed.