title: How to add &nbsp; using d3.js selection.text() method
body: <p><code>selection.text('&amp;nbsp;')</code> appears to convert the special characters so it renders the actual text, rather than a space like I want.  Is there a way to prevent the <code>text()</code> method on selections from doing this escaping for me?  For context, this is a table cell that is empty for some elements in the selection, and I need the space in there so that the cells render properly.</p>