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-commentary/plugin/commentary.vim

@@ -0,0 +1,75 @@
+" commentary.vim - Comment stuff out
+" Maintainer:   Tim Pope <http://tpo.pe/>
+" Version:      1.1
+" GetLatestVimScripts: 3695 1 :AutoInstall: commentary.vim
+
+if exists("g:loaded_commentary") || &cp || v:version < 700
+  finish
+endif
+let g:loaded_commentary = 1
+
+function! s:go(type,...) abort
+  if a:0
+    let [lnum1, lnum2] = [a:type, a:1]
+  else
+    let [lnum1, lnum2] = [line("'["), line("']")]
+  endif
+
+  let [l, r] = split(substitute(substitute(&commentstring,'\S\zs%s',' %s',''),'%s\ze\S','%s ',''),'%s',1)
+  let uncomment = 2
+  for lnum in range(lnum1,lnum2)
+    let line = matchstr(getline(lnum),'\S.*\s\@<!')
+    if line != '' && (stridx(line,l) || line[strlen(line)-strlen(r) : -1] != r)
+      let uncomment = 0
+    endif
+  endfor
+
+  for lnum in range(lnum1,lnum2)
+    let line = getline(lnum)
+    if strlen(r) > 2 && l.r !~# '\\'
+      let line = substitute(line,
+            \'\M'.r[0:-2].'\zs\d\*\ze'.r[-1:-1].'\|'.l[0].'\zs\d\*\ze'.l[1:-1],
+            \'\=substitute(submatch(0)+1-uncomment,"^0$\\|^-\\d*$","","")','g')
+    endif
+    if uncomment
+      let line = substitute(line,'\S.*\s\@<!','\=submatch(0)[strlen(l):-strlen(r)-1]','')
+    else
+      let line = substitute(line,'^\%('.matchstr(getline(lnum1),'^\s*').'\|\s*\)\zs.*\S\@<=','\=l.submatch(0).r','')
+    endif
+    call setline(lnum,line)
+  endfor
+endfunction
+
+function! s:undo()
+  let [l, r] = split(substitute(substitute(&commentstring,'\S\zs%s',' %s',''),'%s\ze\S','%s ',''),'%s',1)
+  let lnums = [line('.')+1, line('.')-2]
+  for [index, dir, bound, line] in [[0, -1, 1, ''], [1, 1, line('$'), '']]
+    while lnums[index] != bound && line ==# '' || !(stridx(line,l) || line[strlen(line)-strlen(r) : -1] != r)
+      let lnums[index] += dir
+      let line = matchstr(getline(lnums[index]+dir),'\S.*\s\@<!')
+    endwhile
+  endfor
+  call s:go(lnums[0], lnums[1])
+  silent! call repeat#set("\<Plug>CommentaryUndo")
+endfunction
+
+xnoremap <silent> <Plug>Commentary     :<C-U>call <SID>go(line("'<"),line("'>"))<CR>
+nnoremap <silent> <Plug>Commentary     :<C-U>set opfunc=<SID>go<CR>g@
+nnoremap <silent> <Plug>CommentaryLine :<C-U>set opfunc=<SID>go<Bar>exe 'norm! 'v:count1.'g@_'<CR>
+nnoremap <silent> <Plug>CommentaryUndo :<C-U>call <SID>undo()<CR>
+
+if !hasmapto('<Plug>Commentary') || maparg('gc','n') ==# ''
+  xmap gc  <Plug>Commentary
+  nmap gc  <Plug>Commentary
+  nmap gcc <Plug>CommentaryLine
+  nmap gcu <Plug>CommentaryUndo
+endif
+
+if maparg('\\','n') ==# '' && maparg('\','n') ==# ''
+  xmap \\  <Plug>Commentary
+  nmap \\  <Plug>Commentary
+  nmap \\\ <Plug>CommentaryLine
+  nmap \\u <Plug>CommentaryUndo
+endif
+
+" vim:set et sw=2: