do not clean/install automatically

test/vimrc

@@ -7,7 +7,6 @@ set rtp+=~/.vim/vundle.git/
 
 call vundle#rc('/tmp/vundle_bundles')
 
-silent BundleClean!
 
 " vim-scripts name
 Bundle 'molokai'
@@ -47,8 +46,6 @@ filetype plugin indent on      " Automatically detect file types.
 
 set wildignore+=doc              " should not break helptags
 
-BundleInstall
-
 func! s:assert_bundles() abort
   for b in g:vundle#bundles
     if (!b.installed())