vim: load NERDTree eagerly if opening vim with a directory argument
vim: load NERDTree eagerly if opening vim with a directory argument

Because if you don't do this, netrw will be used, and at least with my
set-up, it is going to behave poorly when you try to open a file (for
example, it will open it in a split).

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent