add bundle.rtpath to &rtp on require

autoload/vundle/config.vim

@@ -13,6 +13,7 @@ func! vundle#config#init()
 endf
 
 func! vundle#config#require(bundle)
+  call s:rtp_add(a:bundle.rtpath())
   call s:rtp_add(g:bundle_dir)
   " TODO: it has to be relative rtpath, not bundle.name
   exec 'runtime! '.a:bundle.name.'/plugin/*.vim'