Vim now automatically removes trailing whitespace.

vim/vimrc

@@ -72,3 +72,15 @@ set shiftround            " always indent/outdent to the nearest tabstop
 set expandtab             " use spaces instead of tabs
 set smarttab              " use tabs at the start of a line, spaces elsewhere
 set nowrap                " don't wrap text
+
+match ErrorMsg '\s\+$'    " mark trailing whitespace
+
+" Removes trailing spaces
+function! TrimWhiteSpace()
+     %s/\s\+$//e
+     endfunction
+
+autocmd FileWritePre    * :call TrimWhiteSpace()
+autocmd FileAppendPre   * :call TrimWhiteSpace()
+autocmd FilterWritePre  * :call TrimWhiteSpace()
+autocmd BufWritePre     * :call TrimWhiteSpace()