title: Don't show negative sign d3 axis labels
body: <p>I have a scale in which I don't want the negative signs to appear before the numbers - how can this be done in the d3 formatter?  The scale is built as follows:</p>
  
  <pre><code>var formater = d3.format("0");
  
  self.x = d3.scale.linear().domain([self.xmin, self.xmax]).range([0, self.settings.width])
  
      self.axis = d3.svg.axis()
          .scale(self.x)
          .orient("bottom")
          .tickFormat(formater);
  
      self.axisLabels = self.svg.append("g")
                      .attr("class", "axis")
                      .attr("id", "axis")
                      .call(self.axis)
  </code></pre>
  
  <p>I see an option to add a "+" sign but not remove a "-" sign <a href="https://github.com/mbostock/d3/wiki/Formatting#wiki-d3_format" rel="nofollow">https://github.com/mbostock/d3/wiki/Formatting#wiki-d3_format</a></p>
  
  <p>Also, is it possible to remove one label?  I'm labeling from -5 to 5 on the scale, and don't want the negative signs to appear, and I don't want to label 0.  Thanks.</p>