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/syntastic/syntax_checkers/python/pep257.vim

@@ -13,11 +13,6 @@ let g:loaded_syntastic_python_pep257_checker = 1
 let s:save_cpo = &cpo
 set cpo&vim
 
-" sanity: kill empty lines here rather than munging errorformat
-function! SyntaxCheckers_python_pep257_Preprocess(errors)
-    return filter(copy(a:errors), 'v:val != ""')
-endfunction
-
 function! SyntaxCheckers_python_pep257_GetLocList() dict
     let makeprg = self.makeprgBuild({})
 
@@ -30,7 +25,7 @@ function! SyntaxCheckers_python_pep257_GetLocList() dict
         \ 'makeprg': makeprg,
         \ 'errorformat': errorformat,
         \ 'subtype': 'Style',
-        \ 'preprocess': 'SyntaxCheckers_python_pep257_Preprocess',
+        \ 'preprocess': 'killEmpty',
         \ 'postprocess': ['compressWhitespace'] })
 
     " pep257 outputs byte offsets rather than column numbers