junegunn/vim-plug — pull request #52 by mjwhitta (2014-08-10 15:54:08+00:00)
Title: Can now load plugins w/o git being installed

If git is not installed, still allow Plug to be called. Also allow the
user to ignore the git warning by calling plug#begin() with 2 params.
Passing a 1 for a:2 will hide the warning:
plug#begin('~/.vim/plugged', 1)