Added vim-commentary and updarted the plugins.

commentary:
Comment stuff out.  Use `gcc` to comment out a line (takes a count),
`gc` to comment out the target of a motion (for example, `gcap` to
comment out a paragraph), and `gc` in visual mode to comment out the
selection.  That's it.

sources_non_forked/vim-airline/autoload/airline/extensions/tabline.vim

@@ -31,6 +31,7 @@ function! airline#extensions#tabline#init(ext)
 
   autocmd User AirlineToggledOn call s:toggle_on()
   autocmd User AirlineToggledOff call s:toggle_off()
+  autocmd BufDelete * let s:current_bufnr = -1
 
   call s:toggle_on()
   call a:ext.add_theme_func('airline#extensions#tabline#load_theme')