title: MacVim (iterm2/tmux) bind alt/meta
body: <p>I have this nice set of vim mappings</p>
  
  <pre><code>" Drag Current Line/s Vertically
  nnoremap &lt;M-j&gt; :m+&lt;CR&gt;
  nnoremap &lt;M-k&gt; :m-2&lt;CR&gt;
  inoremap &lt;M-j&gt; &lt;Esc&gt;:m+&lt;CR&gt;
  inoremap &lt;M-k&gt; &lt;Esc&gt;:m-2&lt;CR&gt;
  vnoremap &lt;M-j&gt; :m'&gt;+&lt;CR&gt;gv
  </code></pre>
  
  <p>that I can't get to work on Mac/iTerm2/Tmux/vim combo. The problem I guess is in Alt key not getting mapped.</p>
  
  <p>P.S. "Left option key acts as" is set to <code>+Esc</code> in iTerm session keys preferences</p>