title: vim shell key mapping to execute shell commands
body: <p>i am using <a href="https://github.com/Shougo/vimshell.vim" rel="noreferrer">vimshell</a> to execute commands inside vim</p>
  
  <pre><code>nnoremap &lt;leader&gt;vs :VimShellPop&lt;CR&gt;
  </code></pre>
  
  <p>with this key mapping i can open vim shell and execute commands like 'bundle install' and then
  type exit to exit VimShellPop window but i want set a key mapping </p>
  
  <pre><code>nnoremap &lt;leader&gt;bi :
  </code></pre>
  
  <p>to open up vimshellpop execute the bundle install command and exit once i get completed..is it possible in vimshell?</p>