title: Configure Macvim's text selection to not include character under cursor
body: <p>Using macvim, when I copy a text selection, it always includes the character under the cursor.</p>
  
  <p>For example, if the cursor is at the far left and I press shift-down arrow, it selects the entire line <strong>plus</strong> the first character of the next line (since the cursor is sitting over the next line's first character).</p>
  
  <p>Is there a way to configure macvim to not include the cursor character in text selections?</p>