Merge https://github.com/mduan/vundle

autoload/vundle/installer.vim

@@ -208,7 +208,7 @@ func! s:sync(bang, bundle) abort
   let git_dir = expand(a:bundle.path().'/.git/', 1)
   if isdirectory(git_dir) || filereadable(expand(a:bundle.path().'/.git', 1))
     if !(a:bang) | return 'todate' | endif
-    let cmd = 'cd '.shellescape(a:bundle.path()).' && git pull'
+    let cmd = 'cd '.shellescape(a:bundle.path()).' && git pull && git submodule update --init --recursive'
 
     if (has('win32') || has('win64'))
       let cmd = substitute(cmd, '^cd ','cd /d ','')  " add /d switch to change drives
@@ -218,7 +218,7 @@ func! s:sync(bang, bundle) abort
     let get_current_sha = 'cd '.shellescape(a:bundle.path()).' && git rev-parse HEAD'
     let initial_sha = s:system(get_current_sha)[0:15]
   else
-    let cmd = 'git clone '.a:bundle.uri.' '.shellescape(a:bundle.path())
+    let cmd = 'git clone --recursive '.a:bundle.uri.' '.shellescape(a:bundle.path())
     let initial_sha = ''
   endif