Display [noperm] with modifiable, but not readable buffers
Display [noperm] with modifiable, but not readable buffers

Based on: https://github.com/vim-airline/vim-airline/issues/633#issuecomment-174504456
Fixes: https://github.com/vim-airline/vim-airline/issues/633.

bling/vim-airline,unphased/vim-airline,sappo/vim-airline,dalguji/vim-airline,rchicoli/vim-airline,wilywampa/vim-airline,HarmtH/vim-airline,tschundler/dotfiles,tschundler/dotfiles,yzhou61/vim-airline,tschundler/dotfiles,chrisbra/vim-airline,vim-IDE/vim-airline